Question

10.

Answer 1

Answer:

B is correct...

Explanation:

this sign (:) is used when you are trying to explain something or name different things that are involved in one particular thing. and then after that you use comma to separate them.

Answer 2

Answer:

B. In the early years of the space program, astronauts studied three complex subjects: rocket engines, flight mechanics, and computer theory.

Explanation:

The correct sentence is sentence B, "In the early years of the space program, astronauts studied three complex subjects: rocket engines, flight mechanics, and computer theory.

A colon is often used before a list. However, it is important to remember that the part of the sentence before a colon needs to be a complete sentence. We could just say, "In the early years of the space program, astronauts studied three complex subjects," is a complete sentence that could stand alone.