Choose the incorrect statement with respect to photoperiodism.

• A

  The relative photoperiod and dark period perceiving part of the plant is leaves. 

• B

  The hormonal substance responsible for flowering is transported from leaves to shoot apices.

• C

  Short day plants require exposure to light less than the critical photoperiod.  

• D

  A few plants are day-neutral plants which show correlation between exposure to light duration and induction of flowering.