When did faulting along line XY occur

The event must have occurred after the erosion of D and before the deposition of C

Explanation:

The event must have occurred after the erosion of D and before the deposition of C. This is a relative dating problem that can be solved by the principle of cross-cutting relationship.

This principle states that:

A rock cut by a certain fault is older than the fault itself.

 Since the fault does not pass through layer C, it is older than C.

Therefore, the faulting terminated at D. The event must have occurred after the erosion of D and before the deposition of C

wheres the answers ?

chert is a sedimentary rock composed of microcrystalline or cryptocrystalline silica. with this little bit of information, you can come to the conclusion that your answer is c.  

explanation: