Read the excerpt from "Healthy Eating."

It may be an old adage, but it's a goody: you are what you eat. It's also when you eat and how much you eat. And while we can all sympathize with the need to have things fast and easy in our busy lives, nutritionists say eating well is actually not that hard. It just takes planning and, some would say, a little help from the village.

What makes this part of the author's argument effective?

A: She uses a quotation from an expert.
B: She uses facts from a reliable source.
C: She addresses a counterclaim.
D: She supports her claim with reasons.