Select the most appropriate meaning of the highlighted idiom in the following sentence.
The local police were working hand in glove with Federal Bureau of Investigation to find the reasons behind the murder.

Correct option is B

Option (b) is the correct meaning of the given idiom.
Idiom: Hand in glove – It means to work in very close association or cooperation, often secretly or for a specific purpose. (हाथ मिलाकर मिलकर काम करना, गुप्त या बहुत करीबी संबंध में)
Example: The two departments worked hand in glove to expose the tax fraud.
Other related idioms and their meanings:
Go hand in hand – To be closely connected or go together.
Close at hand – Nearby or easily accessible.
Give someone a hand – To help someone.