Which Sentence Contains Wording That Reinforces a Stereotype Based on Age

Which sentence contains wording that reinforces a stereotype based on age?

A) Their website is such a mess, it must have been designed by a Baby Boomer.
B) Carlita is the youngest attorney to ever work at our firm.
C) After reviewing their advertising ideas, I'm not sure your team is mature enough to work on this campaign.
D) We need someone experienced for this job.
E) Felicity is our senior accountant, but lately she has been forgetting to pay vendors on time.