In growing chrysanthemums as cut flowers the plant requires which of the following conditions to maintain a vegetative state of growth?
A. Day length at less than 9.5 hours growing at 60 degrees
B. Day length between 11 and 12 hours growing at 80 degrees
C. Day length at 10.5 hours growing at 60 degrees
D. Day length greater than 14.5 hours growing at 60 degrees
Answer: D. Day length greater than 14.5 hours growing at 60 degrees