Answer:
The correct answer is "White petals and strong scent".
Explanation:
Moths are insects that usually pollinate during night. Being nocturnal animals, moths prefer flowers with white petals and strong scent that are easier to find in the dark. No all moths are nocturnal, but since Nancy is taking a walk after dinner in her garden, it is very likely that she is walking during night, which makes more likely that the moths are hovering around flowers with white petals and strong scent.
