HELP. College Board: Test 7 Section 3,#28

<ol>
<li>Between the sales manager and I existed an easy, cooperative working relationship; neither of us hesitated to discuss problems.</li>
</ol>

<p>this question is in the writing section and asks for the correction. the choices were:
A. and I
B. existed
C. an easy
D. neither of us
E. No Error</p>

<p>the book tells me that the answer is A, but i don't understand how. </p>

<p>help?
thanks :)</p>

<p>It’s not and I but “and ME”</p>