He did not succeed in his endeavour.

A. enterprise

B. effort

C. trick

D. plan

Answer: Option B

Solution(By Examveda Team)

Enterprise : a project or undertaking, especially a bold or complex one.
Effort : a vigorous or determined attempt.
Trick : a cunning act or scheme intended to deceive or outwit someone.
Plan : a detailed proposal for doing or achieving something.
Endeavour : an attempt to achieve a goal.

Synonym of Endeavour is Effort