Choose the grammatically correct sentence:-

Reema said that she didn't believe me.

The correct answer is Option (4) → Reema said that she didn't believe me.

Let us break down each option to determine the grammatically correct one:

A. Reema said I didn't believe. This sentence lacks clarity in terms of who Reema didn't believe. It's unclear whether Reema is expressing disbelief in herself or someone else. Additionally, the verb tense "didn't believe" is appropriate for past tense narration, but it requires clarification regarding the subject.

B. Reema said she don't believe. The verb "don't" is incorrect here because it doesn't agree with the subject "she." The correct form of the verb in the third person singular present tense should be "doesn't." Additionally, there is a lack of clarity regarding who or what Reema doesn't believe.

C. Reema said I don't believe you. This sentence is grammatically correct. It conveys that Reema is stating she doesn't believe the person she's addressing ("you"). The verb tense "don't believe" is appropriate for the present tense, and the pronouns are used correctly.

D. Reema said that she didn't believe me. This sentence is also grammatically correct. It indicates that Reema expressed disbelief towards the speaker ("me"). The verb tense "didn't believe" is appropriate for the past tense, and the use of "that" clarifies the subordinate clause.

Therefore, the grammatically correct sentence is (D) Reema said that she didn't believe me. This option provides clarity in terms of the subject and object of disbelief and uses the correct verb tense and pronouns.