<p>The radio station received [the most number of calls] from listeners [on the evening] [it] aired a discussion of [the music of] Aretha Franklin </p>
<p>answer is A can you explain why the answer is A? thanks</p>
<p>“most” means “greatest in number.” “most number” is redundant. </p>
<p>You would say either “the most calls” or “the greatest number of calls.”</p>
<p>Similarly, you would say either “I received more calls” or “I received a greater number of calls,” not “I received more number of calls”</p>