B) Yours Truly is the correct way to write in a business letter.
The correct answer to this question should be <span>A. </span><span>Somewhere in these boxes is my birth certificate. The verb agrees with its subject which is singular as in this sentence in its passive voice. The subject is "my birth certificate" and the verb used is "is".</span>
<span>B. a map is the answer </span><span />
