The correct answer is D. The.
The word “the” is used to refer to a specific thing or person. In this case, the speaker is asking who spilled the tea on the floor. The speaker is not asking about a general amount of tea, or about a few drops of tea, or about a lot of tea. The speaker is asking about a specific instance of tea being spilled on the floor. Therefore, the correct answer is “the.”
The word “much” is used to refer to a large amount of something. In this case, the speaker is not asking about a large amount of tea. The speaker is asking about a specific instance of tea being spilled on the floor. Therefore, the answer “much” is not correct.
The word “a” is used to refer to an indefinite amount of something. In this case, the speaker is not asking about an indefinite amount of tea. The speaker is asking about a specific instance of tea being spilled on the floor. Therefore, the answer “a” is not correct.
The word “few” is used to refer to a small number of something. In this case, the speaker is not asking about a small number of tea. The speaker is asking about a specific instance of tea being spilled on the floor. Therefore, the answer “few” is not correct.