Fill in the blank with correct Adjective clause:

The club chairman, ____ the member thought to be trustworthy has just disappeared with the club's money.

whom

The correct answer is Option (3) → whom

The sentence should read: "The club chairman, **whom** the member thought to be trustworthy, has just disappeared with the club's money."

In this context, "whom" introduces the relative clause that provides additional information about the club chairman, specifying that the member thought the chairman to be trustworthy.