Topic: verb (ক্রিয়া),

Best Answer Explained in Below-:

The correct answer to the question "We have to help her (find) her keys." is A) find. This choice is appropriate due to the structure of the verb phrases involved.

In English, the verb "help" is typically followed by the base form of another verb, which in this case is "find." The sentence "We have to help her find her keys" maintains a clear and direct meaning, indicating that the action of helping is tied to the action of finding. It reflects the standard pattern of "help" + object + bare infinitive (the base form of the verb without 'to').

Option B) "in finding" introduces a gerund, which is less direct and would imply providing assistance in the process rather than directly actionable support. Option C) "to find" uses the infinitive form, which, while grammatically correct in certain contexts, does not fit the structure after "help." Finally, Option D) "by finding" would suggest that the assistance comes through the act of finding, which again alters the intended meaning. Therefore, A) find is the most suitable choice, preserving the intended action and clarity of the sentence.