Read the passage and answer the question.
When a spacecraft is launched, most of its weight is fuel. Rockets must carry both the fuel and the oxygen to burn it, because there is no air in space. This is why engineers try to make every part of a spacecraft as light as possible, and why costs fall when parts of a rocket can be reused.
What lowers the costs, according to the passage?
Answer and explanation
Correct answer: D. Reusing parts of a rocket
- Step 1: The passage ends by noting that reuse lowers costs.
Answer
Reusing parts of a rocket.
Why not the others: The other options raise costs or are not mentioned.
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