Which Statement About Choosing Between a Smaller Sooner Reward and a Larger

Which statement about choosing between a smaller sooner reward and a larger delayed reward is TRUE?

A) Drug users always select the smaller sooner reward.
B) Non-drug users always select the larger delayed reward.
C) As the delay to both options increases,humans behave more irrationally.
D) As the smaller sooner reward becomes more immediate,humans behave more irrationally.