74) Having spent a lot of time formulating the plan, the CEO’s frustration resulted from the Board not understanding his proposal
(A) the CEO’s frustration resulted from the Board not understanding his proposal
(B) that the Board did not understand his proposal frustrated the CEO
(C) the CEO was frustrated as a result of the Board not understanding his proposal
(D) the CEO was frustrated at the Board’s failure to understand his proposal
(E) the Board’s failing to understand his proposal frustrated the CEO
the problem with original sentence is that "having" modifies the CEO's frustration which is not correct. it should modify the CEO because he is the one "having" not his frustration.
knowing this, we are left with choices C & D.
in choice C, " as a result" should be followed by a noun not "board not understading" because it's wordy and akwardly phrased.
so the correct answer is D
hope that helps