Why do most of the flowers in a temperate deciduous forest bloom in the spring?

A) The largest number of insect pollinators is available in the spring.
B) The spring is the dry season; most of the rain falls during the cool, wet winters.
C) Nutrients are most available in the spring.
D) The leaves of deciduous trees do not block the light in the spring; therefore, sunlight reaches the forest floor.
E) In the spring, the trees do not block the wind and thus do not prevent wind pollination.