The correct answer would be:
B. Paco me lo da
Option A: means Paco it to me gives which isn't grammatically correct.
Option C: has the word los in it meaning more than one while 'me' is singular which makes it incorrect.
Option D: The word 'dala' is used incorrectly since 'da' and 'la' are both together which is not correct.
Therefore, Option B is the correct answer
Hope this helps! :3