选择正确的一项,补全对话.1:When is your birthday?( )2:How many birthdays

选择正确的一项,补全对话.1:When is your birthday?( )2:How many birthdays are there in July?( )
3:What are you doing?( )4:Is your birthday in December?( )A:No,it isn't.B:I am making a cake.C:My birthday is in March.D:There are four.