Question 2 is A. This is the same in a lot of the world (the number of months in a year is the same at least)
Question 3 is C. This is something you just have to memorize if your country doesn’t have 4 seasons.
Question 4 is C but to be honest, in spoken English (at least in the US), you will also often hear A used.
Question 5 is A. The first person asks if you “can” skate, meaning “are you capable of skating” or “are you able to skate”. The responses are: A-can (I am able to), B-do (I skate - but grammatically this would be incorrect to use) C-will (I am going to skate—which does not answer the question)