What is the topic sentence of this paragraph " life without gravity"

What paragraph?

The topic sentence is often, but not always, the first sentence in a paragraph. Wherever it's located, it tells the MAIN IDEA of the whole paragraph. Which sentence do you think it is?

I agree!

You're welcome!

Expository essays focus on EXPLAINING things.

What is being explained in this essay? How does the writer explain things so you understand?
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Narrative = telling a story
Descriptive = describing one or two things
Persuasive = trying to convince others that you're right about a topic
https://www.time4writing.com/writing-resources/types-of-essays/

D says "to explain"

B says "that explains ... "
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A says "describes" so that's out.
C says "informal tone" -- which could be true, but I think you need to choose between D and B.

You'll need to decide between D and B.

I've never read this work.

Ok thanks

Which of the following statements about life without gravity explains why it is an expository essay. Can you help me with this too please

A. It describes the negative effects of weightlessness before it describes the positive effects.

B. It is a short work of nonfiction that explains a set of processes.
C. It uses an informal tone to convey factual information.
D. It uses real life examples to explain the main points.