<p><span style="">The correct answer is </span><strong style="">(D) whose</strong><span style="">.</span><br></p>
<p>In this sentence, we are looking for a relative pronoun that can refer to "a doctor" and show possession or ownership of the "annual income." The relative pronoun "whose" is used to indicate possession or ownership and is the appropriate choice in this context.</p>
<p>The other options are incorrect because:</p><p><span style="">(A) "who" is used to refer to people, not things or objects.</span></p><p><span style="">(B) "which" is used to refer to things or objects, not people.</span></p><p><span style="">(C) "that" is used to refer to both people and things, but it does not indicate possession or ownership.</span></p>