Answer:
D. the applicant is understating his or her qualifications
Explanation:
From the cover letter excerpt, the common pitfall contained is that the applicant is understating his or her qualifications.
It can be seen from the cover letter excerpt that the applicant did lighting work for many concerts and performances. But instead of selling and projecting his qualification to his potential employer, he understated and belittled it. He brought down his qualification by stating that he did something small after working in "many" concerts and performances.
This is a pitfall contained in the cover letter excerpt.
