Select the most appropriate ANTONYM of the underlined word in the sentence.
He tried to improve the working conditions in his office.

The correct answer is Spoil (Option 1).

Explanation:

1. The word improve means to make something better, enhance its quality, or increase its value.
2. An antonym is a word opposite in meaning to another.
3. The word Spoil means to diminish or destroy the value, quality, or efficiency of something; to make something worse.
4. Therefore, "Spoil" is the exact antonym of "improve".

Meanings of other options:
- Spatter: To cover with spots or drops of something.
- Sprinkle: To scatter small drops or particles of something over an area.
- Specify: To state or identify clearly and definitely.