Please helpp ill mark brainstt and like A geologist logbook contained the observations below. based on these observations, what type of formation is the geologist studying?

- The rock layers on either side of the formation are the same age.
- The ocean floor is wider now than in the past.
- There is evidence of recent, minor volcanic activity.

A ) A mid - ocean ridge.
B ) An island
C ) A trench
D ) A coral reef