When all parts except the leaves of a short-day plant are covered with a light-proof cover and then subjected to short-day light/dark treatment,it will produce flower buds. When a portion of this plant is grafted onto another plant of the same species which has been prevented from flowering by excessive exposure to light,this latter plant will also produce flower buds. Which is the best inference from this result?

• A
  Hormones can transmit information to all parts of plants
• B
  Leaves are more sensitive to the photoperiodic stimulus than other parts of the plant
• C
  The photoperiodic stimulus is received by the leaves and transmitted by a hormone
• D
  The photoperiodic stimulus is received by all parts of the shoot and transmitted by a hormone