The anecdote that introduces this topic, is the beginning sentence.
"When adolescence hit Frances Jensen's sons, she often found herself wondering, like all parents of teenagers, "What were you thinking?"
Answer:
A making an effort to remain focused
Explanation:
I'm smart?
The correct answer is B. Sally has a new blue bedspread.
Why not the other ones?
A. The table was delivered in two, cardboard boxes. - this sentence should not have a coma between 'two' and 'cardboard'
C. It is, an octagonal, wooden table. - we don't put a comma after verb - in this case after 'is'
D. The old, and dusty table had cracked broken legs. - there is no need to put a comma before a conjunction word (i this case - and)