Correct Answer: Gamble

Solution : The correct answer is the first option.

The word that means the same as "wager" is "gamble."

The term "wager" encompasses the act of placing a bet or risking something valuable based on an uncertain outcome. Similarly, the word "gamble" is a fitting synonym, sharing the same connotation of taking a risk or engaging in games of chance, particularly with the potential for gains or losses.

The meanings of the other options are as follows:

Scrutinise means to examine or inspect closely.

Crumble refers to the breaking or collapsing of something into small pieces.

Scrupulous means being diligent, thorough, and attentive to details.

Therefore, the correct synonym is gamble.