Required
Stubborn
Agreeable
Useful
Answer is Right!
Answer is Wrong!
The correct answer is A. Required.
An obligatory action is something that must be done. It is something that is required or expected of you.
For example, it is obligatory to pay your taxes.The other options are not synonyms of obligatory.
B. Stubborn means refusing to change your mind or do what someone tells you to do.
C. Agreeable means pleasant and easy to get along with.
D. Useful means serving a purpose or being of benefit.