8100. It was very perspicacious of the judicial investigation officer to find the cause of the problem so quickly.

✅ The correct answer is option A.
Discerning : having or showing good judgement.

Mysterious : difficult or impossible to understand, explain, or identify.

Clever : quick to understand, learn, and devise or apply ideas; intelligent.

Quick : moving fast or doing something in a short time.

Perspicacious : having a ready insight into and understanding of things.

Synonym of Perspicacious is Discerning