Which of the following sentences does NOT fit well in the paragraph in which it is found?

A
"Many people go to work because they have to in order to make a living." (first paragraph)

B
"They provide medicine when their patients are sick and they need it the most." (second paragraph)

C
"Pediatricians also make sure that their patients are up to date on their shots." (third paragraph)

D
"They are there when their patients need them the most." (fourth paragraph)