It seems like you are referring to a visual diagram of flower parts, but I don't have access to images. However, I can give you some general information:
Typically, moths and other pollinators collect nectar from the nectary of the flower, which is often located at the base of the flower. If there are options labeled A, B, C, and D, look for the part of the flower that corresponds to the location of the nectary, which is usually associated with the ovary or base of the petals.
If you have specific descriptions of parts A, B, C, and D, I could help you identify which one is likely the correct answer.