Answer:
The answer is indeed number 2. was buried.
Explanation:
To extract means to remove, to take out, to pull out, especially by effort or force. But even if readers don't know the meaning of extract, they can assume it is related to removing something by paying attention to context clues. In this case, if someone has a splinter "buried deep" in their finger, it is only logical that it will cause them pain and they will want it removed. Thus, the context clue for the definition of the word extract is "was buried".
