Female Silkworm Moths Lay Fertilized Eggs in the Autumn

Female silkworm moths lay fertilized eggs in the autumn.These eggs hatch in the spring

A) if they have experienced at least two months of cold temperatures (5°C or less) .
B) after steady but slow development over the winter months.
C) as long as the winter is mild.
D) as long as they have been incubated in a warm cocoon during the intervening months.
E) on the first day after a full moon when temperatures have reached 30°C.