7-1-2: What am I missing?

[JugglingReferee]

Originally Posted by tjones1

The ball is out of bounds when it touches…
A. a player who is out of bounds
B. any person, floor or object outside a boundary
C. supports or back of backboard
D. all the above

Is the ball out of bounds when it touches a player who is out of bounds? Yes.

Is the ball out of bounds when it touches any person, floor or object outside a boundary? Yes.

Is the ball out of bounds when it touches a supports or back of backboard? Yes.

So then your answer to the question is (D). These 3 cases may not be all the cases which cause the ball to become dead, but they're all true. IOW, it's options are correct, but incomplete.