"Children Who Receive Immediate Reinforcement Will Show Greater Gains in Arithmetic

"Children who receive immediate reinforcement will show greater gains in arithmetic achievement than children who receive delayed reinforcement." This statement presents

A) a clearly stated testable hypothesis.
B) a broad and general hypothesis which should be broken down into at least two hypotheses.
C) a hypothesis which is not consistent with the previous knowledge.
D) the objective of a study on the effect of immediate vs.delayed reinforcement.