The correct answer is: A. Jack said that he had finished it several days earlier.
The sentence “I finished it several days ago” is in the past perfect tense. The past perfect tense is used to talk about an action that happened before another action in the past. In this case, the action that happened before is “Jack said”. So, the sentence means that Jack finished the task several days before he said it.
The other options are incorrect because they do not use the past perfect tense. Option B uses the simple past tense, which is used to talk about an action that happened at a specific time in the past. Option C uses the present tense, which is used to talk about an action that happens regularly or repeatedly. Option D uses the past participle “finished” as an adjective, which is used to describe a noun.
Here are some examples of how the past perfect tense can be used:
- I had already eaten dinner when you called.
- She had finished her homework before she went to bed.
- We had been to the store before we realized we forgot our money.
- They had seen the movie before it came out on DVD.