Hey there!
This link is All About the topic sentence of a paragraph:
http://www.csun.edu/~hcpas003/topic.html
Hope it helps!
B is correct, "<span> Christina and I went to the same summer camp for years (since we were 8)" </span>parentheses are used when you have some extra information you want to add, but its not completely necessary. Like how they started going to the same summer camp when they were 8, you can still read the sentence fine without it, but it's a nice piece of information.
Answer:
The first picture I believe is Idiom.
Explanation:
Idiom is literally something that is described that makes no sense, like bad blood.
