Teamwork, or cooperation, is ________ it takes for a football team to win a game.
|   A. that  |    B. as  |    C. which  |    D. what  |  
Teamwork, or cooperation, is ________ it takes for a football team to win a game.
|   A. that  |    B. as  |    C. which  |    D. what  |  
D