10.
Read the sentence and answer the question.

Since the late 1970s, many astronauts have held advanced degrees this education has been useful for mission specialists.

Which correctly shows where a semicolon is needed in the sentence?


A. Since the late 1970s, many astronauts have held advanced degrees; this education has been useful for mission specialists.


B. Since the late 1970s, many astronauts have; held advanced degrees this education has been useful for mission specialists.


C. Since the late 1970s, many astronauts have held advanced degrees this education has been useful; for mission specialists.


D. Since the late 1970s; many astronauts have held advanced degrees this education has been useful for mission specialists.