Which Statement Is NOT True About Photoperiodism

Multiple Choice

Which statement is NOT true about photoperiodism?

A) A short-day plant flowers when the day length is shorter than a critical length.
B) A day-neutral plant flowers according to some form of regulation other than photoperiodism.
C) A long-day plant will flower when the day length is longer than a critical length.
D) The phytochrome form P_fr is converted to P_r in daylight,producing the active form that induces flowering in long-day plants.