Select the most appropriate option that can substitute the highlighted segment in the given sentence.
I have not seen you for last year.

Correct option is A

The correct phrase to use when referring to a period of time extending from a past point to the present is "since."
Therefore, the corrected sentence should be "I have not seen you since last year."
This correctly uses the present perfect tense to indicate the continuation of the state of not seeing someone since a specific past time.