bonjour_india
Hi
EMPOWERgmatVerbal ,
sorry for tagging directly but i am very confused with this one. I was trying to eliminate options using preposition followed by extent but they all seems correct to me. Please tell me correct usage of Extent That/of/to .
Thanks in advance

Hi!
In geology, the term “transform fault potential” denotes the extent to which one tectonic plate could be moved along a major transform fault line, such as California’s San Andreas, by an instantaneous strain release, commonly known as an earthquake.
(A) the extent to which one tectonic plate could be moved
(B) the extent to which one tectonic plate could move
we dont even need to rely on idioms.
Did you notice - by an instantaneous strain release?
So we need could be moved BY. Hence A is correct
I think most of the times idioms are not the only way to select an answer