Explanation: The question at hand is a straightforward test of tense usage in the context of describing weather conditions. The sentence "It is rainy and sunny in Kolkata today" is a statement about the current weather in Kolkata. The key to understanding this sentence lies in recognizing the use of the present tense and the context provided by the word "today."
In English grammar, the present tense is used to describe actions or conditions that are happening now or that are generally true. The present tense is formed using the base form of the verb or the base form with "s" for third-person singular subjects. In this sentence, "is" is the present tense form of the verb "to be," which is used to describe the current state of the weather.
The word "today" in the sentence further reinforces the use of the present tense. "Today" refers to the current day, and when used in a sentence, it indicates that the action or condition is happening now. Therefore, the use of "is" in conjunction with "today" is correct and appropriate for describing the current weather conditions in Kolkata.
It is important to note that the sentence "It is rainy and sunny in Kolkata today" is a valid statement because it is possible for a location to experience both rainy and sunny conditions simultaneously. This can occur during transitional weather patterns or in areas where weather conditions can vary significantly over short distances.
In summary, the correct answer is "Is" because the sentence is describing the current weather conditions in Kolkata using the present tense, which is appropriate for the context provided by the word "today." The other options are incorrect because they either use the past tense or suggest that the sentence could be in both the present and past tenses, which is not possible in this context.