Question

what is the meaning of the prefix sub- in submarine?
the people watched the submarine slowly disappear from view.
under across beside away

Explanation:

To determine the meaning of the prefix "sub - " in "submarine", we analyze the word "submarine" and the context. A submarine operates underwater. The prefix "sub - " often means "under" (e.g., "subway" is a way under the ground, "submerge" means to go under water). The other options "across", "beside", and "away" do not fit the meaning of "submarine" as it is related to being under water.

Answer:

A. under