What is "nectar" primarily composed of?

Nectar is primarily composed of sugars, water, and trace compounds, which make option B the correct answer. The primary sugars found in nectar are sucrose, glucose, and fructose, which serve as an energy source for bees and other pollinators. Water makes up a significant portion of nectar, typically ranging from 70% to 80%, which is essential for the fluidity and transport of nutrients. The trace compounds can include various amino acids, vitamins, and minerals, contributing to the nutritional value of the nectar.

Other options might include components that are not predominant in nectar. For instance, while proteins and fats are important in other biological substances, they constitute a much smaller part of what nectar is made of, as compared to sugars. Similarly, the presence of minerals and vitamins is minimal, making them less relevant in the composition of nectar itself. Thus, the combination of sugars, water, and trace compounds is what defines nectar and its role in the ecosystem as a food source for bees.