The correct answer is: D. Krishna suggested to his friends that they should go to a movie that day.
The sentence “Let us go to a movie today” is a suggestion. A suggestion is a proposal or recommendation that is not made as a demand or command. In this case, Krishna is proposing that he and his friends go to a movie that day. He is not demanding or commanding them to go, but he is making a recommendation.
The other options are incorrect because they do not accurately reflect the meaning of the sentence. Option A is incorrect because it suggests that Krishna is ordering his friends to go to a movie. Option B is incorrect because it suggests that Krishna is asking his friends if they would like to go to a movie. Option C is incorrect because it suggests that Krishna is asking his friends what they think about going to a movie.
In conclusion, the correct answer is: D. Krishna suggested to his friends that they should go to a movie that day.