Final answer:
An attestation engagement involves a CPA issuing a report on a subject matter that is the responsibility of another party, which distinguishes it from other activities such as tax advice or legal testimony.
Step-by-step explanation:
An attestation engagement is where a Certified Public Accountant (CPA) is hired to issue a report on subject matter or an assertion about the subject matter that is the responsibility of another party. This differs from other engagements like providing tax advice, testifying as an expert, or assembling prospective financial statements without providing assurance. So, the correct answer to the student's multiple-choice question is: C. issue, or does issue, a report on subject matter or an assertion about the subject matter that is the responsibility of another party.