Options A and B fit, A only in the case of my 2D game. Watch what happens when you set the frame rate to 40 and 80 in a rather empty area and move around with a simple code like camera.x += 8*time; to move.
"You level up the fastest and easiest if you do things at your own level and no higher or lower" - useful tip
My 2D game - release on Jun 13th; My tutorials