Gregmat verbal quiz question

Could someone please explain syntax of this question?

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Here’s how I rephrased it -
The subordinates found the task given by the CEO __________ because of its very big size.

The answer should be a synonym of large. Suitable options are painstaking and preposterous. “painstaking” means meticulous, but we have no proof the task requires a lot of attention. Hence “preposterous” would be the best option.

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