The Relationship Between Television Viewing and Problems with Attention

The relationship between television viewing and problems with attention

A) is clear in studies involving young children, but not in those involving adolescents.
B) is clear and we know that it is the television viewing that creates the attention problem.
C) is clear and we know that it is because children who have attention problems like to watch television.
D) is unclear because we don't know which is the cause and which is the effect.