The answer is D, the other answers are subtracting and multiplying.
My standard would be based on how it affected those it need, how accessible the invention/charity/etc was, and how they plan to grow in the future. Hope this helps!
Answer:
By explaining the relationship between automobile emissions and global warming
Answer:
B. "The president wanted to be sure Sonia didn't have any problems or ugly secrets in her past."
Explanation:
