Five characteristics of the saguaro cactus are listed below. Which of these characteristics is likely to make the saguaro cactus specially adapted for pollination by the lesser long-nosed bat?

The saguaro's flowers open at night and close during the day.
The saguaro's flowers produce a sweet nectar.
The saguaro's flowers are typically located high off the ground.
The saguaro cactus has a waxy coating to prevent water loss.
The saguaro cactus is found only in the Sonoran desert.