A detailed list of the experience and the profession is included in the cover letter. In the excerpt, the applicant is trying to be humorous. Thus, option c is the common pitfall.
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A common pitfall is a mistake or a problem that occurs in writing and can be avoided by following rules and codes. Here in the excerpt, the applicant is not overstating his qualifications, nor does he appears selfish.
He is trying to sound funny and humorous by stating about not getting electrocuted during his job which is a mistake as the cover letter is formal and does not need to be funny. Also using concrete language is not a mistake.
Therefore, option c. the humorous tone is a common pitfall.
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