I believe it would be B, because there are two subjects that the speaker is referring to at the beginning of the sentence; the caterpillar and the leaf. When they use the word "it" in the second half of the sentence it is unclear whether they mean to say if "it" is the leaf or the caterpillar which they are carrying to their brother.
The answer would be A, because of its use of commas, and pauses. Hope I helped.
Answer:
I must always obey to my parents.
I mustn't steal anything from anyone.
The research question that is most effective is A. How did natural gas affect the ozone layer in 1975?
<h3>What is a research question?</h3>
It should be noted that a research question simply means the question that the researcher seeks answers to.
In this case, the research question that is most effective is "How did natural gas affect the ozone layer in 1975?". It must reflect what the researcher wants.
Learn more about research on:
brainly.com/question/25257437
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I'm pretty sure it's B. Sharing of ideas :)
Hope this helped
-Diego