<p>A long-standing theory about the migration of green turtles was ------- by an innovative marine biologist who graciously defused potential ------- by dedicating her work to the original researcher. </p>
<p>(A) instigated . . rancor
(B) renounced . . approval
(C) displaced . . attribution
(D) enhanced . . alteration
(E) repudiated . . acrimony</p>
<p>I was down to D and E. CB said that both enhanced and repudiated can go in the first blank but it doesn't make sense for altercation to go in the second. It said altercation means modification but the dictionary says it is an argument or disagreement.</p>
<p>The answer is E.</p>