Under which of the following conditions would the red:far-red
ratio of ambient light be the lowest? a)In the middle of the day
when there are no clouds

b)Close to sunset, when the sky is alight with an orange
glow

c)At night, when the only light available is from the moon and
stars

d)On the forest floor, under the canopy of larger plants

e)During the day when the sun is blocked by clouds