Moths feed on flowers that are open at night. These flowers are usually:-
a) dull in color with no nectar but a strong scent
b) brightly colored and unscented
c) pale in color and sweetly scented
d) scented like a rotting egg

Some plants' flowers open at night and smell better at night. This helps moths find food, which they do by following smells (and mates). 

 Typical moth flowers, like jimsonweed, stephanotis, and honeysuckle, are light in color, often long and thin, and don't have places for the moths to land. Some of the petals have fringes, and the nectar is often in a spur. At night, when they are open, the smell is overpowering. Most of the time, these flowers are white or pale, which helps them reflect moonlight and be seen from far away by pollinators that only come out at night.