问题

David,howoldisyourfatherthisyear—______.Andwejusthadaspecialpartyforhis_____birthdaylastweekend.
A:;Fortieth;forty;
B:;Forty;forty
C:;Forty;fortieth
D:;Fortieth;fortieth;
B:;Forty;forty
C:;Forty;fortieth
D:;Fortieth;fortieth;
正确答案是: