English · Combination Mistake

Option B is correct because it is the only sentence that adheres perfectly to grammar rules. The first part of the sentence is in the past perfect tense (indicated by the verb form "had he"), so the next part of the sentence should also conform to the same tense so the correct context should be “would have”.

This option uses the conditional tense (had + past participle) to describe a hypothetical past situation, but the consequence (would miss) is in the present tense, which doesn't match the conditional tense. Incorrect.

This option uses the conditional perfect tense (had + past participle + would have + past participle) to describe a hypothetical past situation and its consequences, which is the correct form. Correct!

Conditional tense: Use the conditional tense (had + past participle) to describe hypothetical past situations.

This option uses the past perfect tense (had + past participle) twice, which is redundant and incorrect. Incorrect.

This option uses the conditional tense (had + past participle) to describe a hypothetical past situation, but the consequence (will missed) is in the future tense and carries wrong form of the verb with it (missed), which doesn't match the conditional tense. Incorrect.