Question

which sentence uses a semicolon correctly? nasa is planning to send astronauts to the moon; but it will take several years to accomplish. because nasa wanted to run tests before sending people; one rocket has already circled the moon and returned to earth. the next big step in the moon mission is to send a crew of four astronauts to the moon; the mission will take about 10 days. if the moon mission is successful, nasa hopes to send astronauts to mars in the future.

Explanation:

A semicolon is used to separate two independent clauses that are closely related in thought. In the first option, "but" is a coordinating conjunction and a comma should be used before it instead of a semicolon. In the second option, the first part "Because NASA wanted to run tests before sending people" is a dependent - clause, so a semicolon is incorrect. The fourth option has no need for a semicolon as it is a single - clause statement with a conditional. The third option has two independent clauses "The next big step in the moon mission is to send a crew of four astronauts to the moon" and "the mission will take about 10 days" that are closely related, making the semicolon usage correct.

Answer:

The next big step in the moon mission is to send a crew of four astronauts to the moon; the mission will take about 10 days.