Complete the idioms/proverbs used in the following sentences:

The police said that their inquiries had unfortunately come to a _____________ end.

Correct option is A

The correct idiom to complete the sentence is "dead end."

The police said that their inquiries had unfortunately come to a dead end.

Meaning of the idiom:
"Dead end" refers to a situation where no further progress or development is possible.
Hindi Meaning: ऐसी स्थिति जहां कोई और प्रगति संभव न हो।

• Dead: Correct word to complete the idiom.
  Example: After searching for hours, the hikers reached a dead end on the trail.

• Closed: Does not fit in the idiom.
  Example: The case has been officially closed.

• Long: Does not make sense in the context.
  Example: He wrote a long letter explaining his views.

• Short: Incorrect in this context.
  Example: The short trip was memorable.