I answered C and got it correct.
(A) It is
more important that a proposal unite the entire team
than that it be highly effective. --- Not mentioned
(B) The proposal is rudimentary and naive. --- This is what the narrator of the passage says, not the board of trustees
(C) The recommendations of the political counsel will be effective and unite the whole team. --- Correct, in the middle of the passage you see "proposal by the board of trustees, which believes the proposal will be effective and, moreover, that it will unite the team by reflecting a variety of interests."
(D) The
board of trustees will be
more effective than the political counsel. --- Not mentioned, also opposite to the claims made.
(E) The ideas of the political counsel are
flawed and should not be implemented. --- I would say that this tone is too negative for the passage.