Synonym of OBLIGATORY
Answer: Option A
Solution(By Examveda Team)Required : officially compulsory, or otherwise considered essential; indispensable.
Stubborn : having or showing dogged determination not to change one's attitude or position on something, especially in spite of good arguments or reasons to do so.
Agreeable : quite enjoyable and pleasurable; pleasant.
Useful : able to be used for a practical purpose or in several ways.
Obligatory : required by a legal, moral, or other rule; compulsory.
Synonym of Obligatory is Required
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