Topic: Conditional Sentence,

Best Answer Explained in Below-:

The sentence "If you had come earlier, you would... found a good seat." is an example of a conditional statement, specifically a third conditional, which is used to talk about hypothetical situations in the past that did not occur. The structure of a third conditional is typically: "If + past perfect, would have + past participle."

In this case, the 'if' clause states the unreal condition: "If you had come earlier," which uses the past perfect tense ("had come") to indicate that the action of coming earlier did not actually happen. The result clause is what would have happened if that condition were true. To complete this clause correctly, we need the phrase "would have found."

The option A) "have" is the correct choice because it completes the phrase correctly as "would have found." The use of "have" in this context indicates the hypothetical result that follows the unreal past condition. The other options—B) "had," C) "can," and D) "has"—do not fit grammatically or contextually within the construction of the third conditional and therefore cannot correctly complete the sentence. Thus, A) "have" is the only option that makes sense.