Answer:
A. Bill's wife has positively reinforced him for bathing the dog.
Explanation:
Bill, having to clean up after dinner every night, likes to see it be cleaned and so if he goes to go do something and comes back and everthing is clean and he no longer has to do it, then it is safe to say that his wife is positively reinforcing him to clean the dog.
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.
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If you're asking what figure of speech, it would be a Simile when using 'like' or 'as' for keywords in the sentence.