Critical Reasoning

Herbal tea has become a popular product and is offered by a number of brands. An investigation showed that out of the 7 brands of tea sold at an average-sized supermarket, all included preservatives and added chemicals for flavor and color. It can be stated, therefore, that in order to drink a truly healthy herbal tea, the ingredients should be collected from a natural source.

Which of the following, if true, supports the argument's conclusion?

A) The increase in the popularity of herbal teas is a result of the emergence of the organic product market.
B) Average-size supermarkets usually offer products with the highest level of consumer awareness.
C) Herbs grown in a garden, with water alone, contain none of the food-industry chemicals that have been proven to disrupt digestion.
D) Some people add large amounts of sugar to herbal tea, increasing the amount of calories in the beverage.
E) Buying tea herbs directly from farms does not rule out the possibility that they contain residue from pesticides or hormones.

OA C

Source: Economist Gmat