The
goal here is to drink a truly healthy herbal tea and the
plan is ingredients should be collected from a natural source
(A) The increase in the popularity of herbal teas is a result of the emergence of the organic product market.
No impact, what caused the popularity of herbal tea is not important to us, we want to know something that increase our confidence in the plan to achieve the goal.
(B) Average-size supermarkets usually offer products with the highest level of consumer awareness.
No impact, again we don't learn anything that increase our confidence in the plan to achieve the goal.
(C) Herbs grown in a garden, with water alone, contain none of the food-industry chemicals that have been proven to disrupt digestion.
Strengthen, if herbs grown are good for health then it increases out belief in the plan that it is a good idea to collect them naturally.
(D) Some people add large amounts of sugar to herbal tea, increasing the amount of calories in the beverage.
No impact, what people do and what happens with calories doesn't increase our belief in the plan.
(E) Buying tea herbs directly from farms does not rule out the possibility that they contain residue from pesticides or hormones.
Weaken, if collecting (buying) those herbs still contain residue from pesticides that it decreases the belief that plan will work.