Explanation: In English grammar, the choice of verb tense is crucial for accurately conveying the time frame of an action or state. The sentence "It ..... warm in Bengaluru yesterday" requires a verb that indicates the warmth was experienced in the past, specifically on the previous day.
The verb "was" is the past tense form of the verb "to be." It is used to describe a state that existed in the past. In this sentence, "was" correctly indicates that the warmth was experienced yesterday, which is a past event. The use of "was" aligns with the context of the sentence, which clearly refers to a past state of warmth.
On the other hand, the verb "is" is the present tense form of the verb "to be." It is used to describe a current state or action. If "is" were used in the sentence, it would incorrectly suggest that the warmth is currently happening, which contradicts the context of the sentence. The sentence specifically mentions "yesterday," which is a past time reference, and thus requires the past tense form "was."
Option C, "Either (A) or (B)," is incorrect because it suggests that both "is" and "was" could be correct. However, only one of these verbs fits the context of the sentence. Since the sentence refers to a past event, only the past tense form "was" is appropriate.
Option D, "Neither (A) nor (B)," is incorrect because it suggests that neither "is" nor "was" is correct. However, the sentence requires a past tense verb to describe the warmth that existed in the past, and "was" is the correct past tense form to use in this context.
In summary, the correct answer is "B) Was" because it accurately reflects the past tense required by the context of the sentence, which describes a state of warmth that existed yesterday. Understanding the correct use of verb tenses is essential for clear and accurate communication in English, particularly in contexts such as competitive examinations where precise language is crucial.