9.
Read the sentence and answer the question.

In 1978, NASA changed the organization of the astronauts 20 mission specialists and 15 new pilot astronauts were chosen.

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


A. In 1978, NASA changed the organization of the astronauts 20 mission specialists; and 15 new pilot astronauts were chosen.


B. In 1978, NASA changed the organization of the astronauts 20 mission specialists and 15 new pilot astronauts; were chosen.


C. In 1978, NASA changed the organization of the astronauts; 20 mission specialists and 15 new pilot astronauts were chosen.


D. In 1978, NASA changed the organization of the astronauts 20 mission specialists and 15; new pilot astronauts were chosen.