Which describes mid-oceanic ridges?

A. transform plate boundary between oceanic plates

B. divergent plate boundary in oceanic plates

C. divergent plate boundary in a continental plate

D. convergent plate boundary involving an oceanic plate

I think the correct answer from the choices listed above is option B. It is divergent plate boundary in a continental plate describes a mid-oceanic ridges. It is an underwater mountain range, formed by plate tectonics. Hope this answers the question. Have a nice day.