Choose the correct answer

Question 1. Tom asked his classmate: “Are you joining us for the party this weekend?”.

A. Tom asked his classmate if is he joining them for the party that weekend.  

B. Tom asked his classmate if he was joining them for the party that weekend.  

C. Tom asked his classmate if he is joining them for the party that weekend.  

D. Tom asked his classmate if was he joining them for the party that weekend.