Identify the grammatically correct sentence:

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A I am knowing the answer to this question.
B She is owning three luxury cars.
C I have known him since childhood.
D They are understanding the lecture completely.

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Answer: C. I have known him since childhood.

Answer: (c) I have known him since childhood.
Explanation: Stative verbs (verbs of thinking, owning, or knowing like know, own, understand) cannot be used in continuous tenses. The phrase "since childhood" requires the Present Perfect Tense to show an action that started in the past and continues to the present.

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Identify the grammatically correct sentence:

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