Approximately 1,000 College Students Were Asked to Keep a Record

Approximately 1,000 college students were asked to keep a record of the types and amounts of supplemental vitamins they consumed and how many colds they had over the course of a year.The amount of vitamin C consumed was compared with the students' incidences of colds.What types of study was this?

A) clinical trial.
B) observational study.
C) intervention trial
D) laboratory study.

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