Christmas Cactus Is a Short-Day Plant That Usually Blooms in the Winter

Multiple Choice

Christmas cactus is a short-day plant that usually blooms in the winter. Which of the following strategies might induce it to bloom for the 4th of July?

A) putting it in a cool, well-lighted place from time to time during June
B) leaving it in a dark closet all night and part of each morning during June
C) putting it in a dark closet for a short time every afternoon during June
D) exposing it to light several times during each night in June