Explanation:

- Exasperate means to irritate or frustrate someone intensely.

- Option 1: Tarnish means to lose or cause to lose luster; it doesn’t relate directly to emotional states, so it's not a suitable antonym.

- Option 2: Belittle means to make someone or something seem less impressive or important. It also carries a negative connotation and doesn’t oppose exasperation.

- Option 3: Please means to give satisfaction or pleasure, directly opposing the act of causing irritation.

- Option 3: Please is the correct antonym.

- Option 4: Annoy closely aligns with exasperate in meaning, as it also means to irritate or disturb.

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