After the election's details were made public, the newspaper received a flood of calls that were far too __________ to manage properly.

The term "many" correctly fills the blank as it logically describes the situation where the newspaper received a large volume of calls in response to the election details being made public. This choice conveys that the newspaper was overwhelmed by the sheer number of calls, which aligns perfectly with the phrase "a flood of calls." The context implies that an excessive quantity was difficult to manage, making "many" the most fitting word to emphasize the overwhelming nature of the situation.

In contrast, "angry" would imply the emotional state of the callers but does not address the volume of calls. "Short" and "few" suggest a lack of quantity, which contradicts the idea of being overwhelmed and is inconsistent with the phrase "a flood of calls." Therefore, "many" is the most appropriate choice to convey the intended meaning of the sentence.