Theory because a theory is a well substantiated explanation of how a particular phenomenon works based on the set of facts which had been repeatedly confirmed through observations and experiments. A scientific theory gives reliable account of a phenomenon.
The recommended dietary allows differs with age, sex, and health status. Leen is an healthy female adult so the RDA should be 15 mg so if she has consumed 6 mg the percentage is 6/15*100 = 40%
