Which rock feature is the line running between points a and b most likely to be?
(i accidentally clicked c.)

Option (D)

Explanation:

A fault is generally defined as the planar or curved fracture that results in the displacement of the rocks on either side of the fault because of the compressional or tensional stress. It is comprised of 2 blocks. The block that is present above the fault is termed as the Hanging-wall, and the block that is below the fault is termed as the Foot-wall.  These blocks undergoes changes with the the type of stress that act on it.

This faults are mainly of 3 types, namely-

(1) Normal fault

(2) Reverse fault

(3) Transform fault

Hence, the correct answer is option (D).

i got something better   a catchphrase here it is

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ahem

what the squwock

explanation:

a physical change is being made.