Which of the following, if true, most strongly suggests that the problems attributed to controlling were actually caused by planning failures?

A) The team assignments in the project plan placed two employees on the quality control team despite their long history of hostility toward each other.
B) The problems attributed to controlling were typical of the problems experienced by other project leaders in the industry.
C) The project plan called for all possible component providers to produce components at their maximum capacity.
D) The list of problems attributed to controlling also included the failure to adequately monitor production output.
E) Even the most effective planning would not have made the project a success given the failures attributed to controlling.

Answer: C
Explanation: C) The project leaders failed to locate alternate component providers, but if Choice C is true, then there were no alternate component providers. Every provider that could have been used was already accounted for. So if Choice C is true, the failure to locate alternate component providers was best described as a planning failure, not a controlling failure. Choice A suggests that the leadership problems were affected by planning issues, but that's a different issue. Choice B suggests that there was nothing special going on here, but that's no reason to blame it all on planning. Choice D mentions an additional problem related to controlling, and so Choice D doesn't shift the focus away from controlling. Choice E shifts the blame for the failure to controlling, which is the opposite of what we're looking for.