<p>American photographer Annie Leibovitz is renowned for her revealing, eye-catching portraits of celebrities, and characterized by carefully staged settings and the use of vivid primary colour.</p>
<p>I chose “each of which are…”</p>
<p>The answer is “which are”.</p>
<p>When are “each of which” used and “which are” used?</p>
<p>Many of blues great Bessie Smith’s songs describe the experiences of southern Black migrants, especially the struggles of Black women to adjust to urban life in northern United States.</p>
<p>Why is it right to use the underlined part instead of “how Black women struggled at adjusting” ? Is it because of “the experiences of southern Black migrants…”?</p>
<p>The problem with “each of which” in the Annie question is that “each” is referring to “celebrities,” not “portraits.”</p>
<p>In the second one, “struggled at adjusting” is not proper idiom; “struggled with adjusting” would be the correct idiom. Plus, underlined portion is more parallel with the independent clause than the phrase starting with “how.”</p>