Fill in the blank with the most appropriate word. I’m tired, so I ________ to bed.

The correct answer is: A. went

The other options are:

• B. have gone: This is incorrect because it is in the present
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  perfect tense, which is used to talk about actions that have happened in the past but have a connection to the present. In this case, the speaker is talking about an action that happened in the past and has no connection to the present.
• C. am going: This is incorrect because it is in the present progressive tense,
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  which is used to talk about actions that are happening now or that will happen in the near future. In this case, the speaker is talking about an action that happened in the past.
• D. had gone: This is incorrect because it is in the past perfect tense, which is used to talk about actions that happened before another action in the past. In this case, the speaker is not talking about two actions in the past, but about one action that happened in the past.

The sentence “I’m tired, so I went to bed” is in the simple past tense, which is used to talk about actions that happened at a specific time in the past. In this case, the speaker is talking about an action that happened at a specific time in the past, namely when they were tired.