400
However, although well compensated earning in 2012 a median annual salary of $90,930, PAs cost healthcare providers less than do the physicians who might otherwise undertake these tasks.
A) NO CHANGE
B) compensated (earning in 2012 a median annual salary of $90,930),
C) compensated, earning in 2012 a median annual salary of $90,930
D) compensated: earning in 2012 a median annual salary of $90,930,
Choice B is the best answer because the parentheses are used correctly to enclose information that is interesting but not essential to the sentence. If the parenthetical information were to be deleted, the sentence would still make sense.