Which nutrients are commonly insufficient in athletes who eliminate dairy products without appropriate dietary substitution? I. calcium II. riboflavin III. vitamin D IV. vitamin B12 A. I and III only B. I, II, and III only C. I, III, and IV only Answer in the poll, then explain your rationale below in the comments! I'll follow up with my breakdown of the question after enough people have responded. From Chapter 9: Basic Nutrition Factors in Health