Answer:
I think it would be "Skunks’ spray is a powerful defense that is difficult to avoid, but skunks do warn before spraying."
Explanation:
Because the other sentences are either talking about the things that get mentioned in the paragraph or only a part of the paragraph. But, the "Skunks' spray is a powerful defense that is difficult to avoid, but skunks do warn before spraying", sums up the whole paragraph. :)
A primary source is a first hand account of what happened. Secondary sources get their information from primary sources.
Omg!! I just did this!!! I can help!!
1. is B.
2. is A.
3. is A.
and 4. is B.
Hope this helped!!!!!!! :))