What factor determines the amount of food you should consume from a food type

Whether you are trying to lose weight, gain weight or maintain your weight is one factor that affects how many calories you should consume. Other factors involved include your basal metabolic rate, activity level and stage in life, as growing children and pregnant and lactating women have higher caloric needs. Changes in your weight can be an indicator of whether you are consuming the appropriate amount of calories.

Your answer is going to be c.