Official Explanation Magoosh:
(A) incorrectly implies that the noun of the sentence “success” vastly underestimated the difficulties. It was the scientists.
(B) changes the meaning so it sounds like the scientists were emboldened by the fact that they vastly underestimated the difficulties, not that they were emboldened by a successful moon landing.
(C) “first moon landing success” slightly changes the meaning. That is, there could be many prior moon landings and this one was the first
...


.jpg)





