okay, but work with me on this one:
The portal is moving at a speed of 1/3rd the length of object A per unit of time T. For convenience i'm gonna go with a 3-meter squared object A and a 1 second time T, so both sides of the portal are moving along at 1m/s. because the two sides are linked, it's basically just a ring passing around object A. The hoop moves forward at a constant speed, and assuming the portal is a massless entity no force is being exerted here.
Now, looking at the same situation, but with one side of the portal being locked at the starting point, and the other side moving at 1m/s:
At time T=0, the moving side of the portal contacts the object and begins moving over it. By time T=1, it has passed over 1/3 of the object, and in doing so has forced 1/3 of the object to exit the orange portal. Because the blue portal is moving at 1m/s, the first third of the object has exited the orange portal at a speed of 1m/s. At time T=2, the portal has traveled another meter forward around the object, and the next 1/3 of the object has exited the orange portal, also traveling at a rate of 1m/s. In a situation where the blue side of the portal does not impart it's velocity to the objects passing through it, as you claim, then if the first third of the object, designated A(1), has already passed through the portal, it should be stationary, and would now be exerting a force equivalent to its mass on the next third of the object, designated A(2). Either way, the portal is creating the same amount of force out of thin air.
like, put it this way: imagine that 1 meter away from the orange portal is an immovable surface. At time T=1 the object contacts that surface but the blue portal keeps moving. From a universal reference frame, what would you expect to have happen? if the object is solid enough to withstand the force, A(2) and A(3) should begin moving with the blue portal, right? and those parts would suddenly be moving at 1m/s relative to a universal reference frame, but from the relative reference frame of the portal nothing would appear to move at all, even as the portals got farther apart from each other. If you assume, however, that a portal should impart no momentum upon the objects passing through it, then the blue portal would continue around the remaining two thirds of object a, and object A would be crushed against the immovable surface, also imparting a force.
Then there's the most wild idea. If object A cannot be compressed, and there is an immovable surface 1m from the orange portal, would it effect the portals movement? Would the blue portal be forced to stop moving, or perhaps would the orange portal be forced to move upwards, to compensate?
That said. Assuming the portals are not impacted by what passes through them, I believe B is the correct answer, based on these ideas.
that said... i can understand why the dev team decided not to fuck with moving portals lol
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