To answer this question, you need to understand the meanings of the given options and choose the one that best fits the context of the sentence.
Option A) Perspicacious - This option means having keen mental perception and understanding. It is often used to describe someone who is observant and insightful. In the context of the sentence, if someone is enthusiastic, perspicacious, and informed, it implies that they have a sharp understanding and perception. This option fits well in the sentence.
Option B) Nubile - This option means sexually mature and attractive, usually used to describe a young woman. This option does not fit the context of the sentence as it does not convey the same meaning as enthusiastic, informed, and someone you look forward to working with.
Option C) Supererogatory - This option means going beyond what is required or expected. While it is a positive characteristic, it does not convey the same meaning as the other qualities mentioned in the sentence.
Option D) Sybaritic - This option means fond of luxury or pleasure. While it also implies a positive quality, it does not fit the context of the sentence as it does not convey the same meaning as enthusiastic, informed, and someone you look forward to working with.
Based on the explanations above, the correct answer is A) Perspicacious. This option best fits the context of the sentence, describing someone who is enthusiastic, observant, and informed.