Question

Which sentence does not contribute to paragraph unity?
a.
When teens stay out late, they must either drive or walk home when they are tired, when visibility is limited, and when crime rates are statistically high.
c.
A reason I believe in teen curfews is my concern for teens' safety.
b.
Therefore, curfews help parents and communities ensure the well-being of their young people by requiring them to be home early.
d.
Although I disagree with some of the traditional consequences for violating a curfew, I feel curfews are a good thing.