It was incumbent on him to report the matter at once.
Options:
A . pointless
B . depending
C . compulsory
D . optional
Answer: Option C Pointless : having little or no sense, use, or purpose. Depending : be controlled or determined by. Compulsory : required by law or a rule; obligatory. Optional : available to be chosen but not obligatory. Incumbent : necessary for (someone) as a duty or responsibility. Synonym of Incumbent is Compulsory
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