Question

When people reply to formal job announcements, they are writing a(n) ______ cover letter since it is for an open position that a company advertises?

Answer 1

The choices were; a. informal, b. chronological, c. serialized, d.conversational, e. solicited.

The answer is, e. solicited. 
A solicited letter is written by the job hunter to the employer. It indicates the kind of working position the job hunter is applying for and also how she/he had learned there is a job opening in that position. 

The employer gets a specific idea on the job hunter's intention and also learn that the ads or announcement reached them.