Explanation: In the context of describing weather conditions, it is important to use the appropriate tense to convey the correct meaning. The sentence "Today, it ..... cold and windy in Delhi" is referring to the current state of the weather, which requires the use of the present tense. The present tense is used to describe actions or conditions that are happening now or that are generally true.
In English grammar, the present tense is used to describe ongoing actions, habits, or current conditions. For example, "It is raining" or "The sun is shining" are both examples of the present tense being used to describe current weather conditions. The verb "is" is the correct choice in this context because it indicates that the weather is currently cold and windy in Delhi.
The past tense, on the other hand, is used to describe actions or conditions that have already happened. For example, "It was raining yesterday" or "The sun was shining last week" are both examples of the past tense being used to describe weather conditions that occurred in the past. In the given sentence, the use of "was" would be incorrect because it would imply that the weather conditions were in the past, which is not the case.
Therefore, the correct answer is "is" because it accurately describes the current weather conditions in Delhi. The other options are incorrect because they either suggest the use of the past tense or do not provide a correct tense for the sentence. Understanding the appropriate use of tenses is crucial for accurately describing current or past conditions in English.