Each question consists of a sentence which is divided into four parts. Only one part in each sentence is not acceptable in standard written English Identify that part which contains an error.

Correct option is C

Option (c) contains an error.
· Explanation: The correct phrase is he insisted on asking, not he insisted to ask. The verb insist is followed by on + gerund (verb+ing).
· Correct sentence: As the meeting was about to end, he insisted on asking several questions.
Grammatical rule used: Verbs followed by prepositions require gerund form of the verb.
· Explanation in Hindi: "Insist" के बाद "on + verb-ing" का प्रयोग किया जाता है।