To ensure proper protection for food during storage the bottom shelf should be at least 3 inches - 3 feet above the ground. This is to protect the food from pests and other organisms that may cause disease and health-problems to people who are going to consume such produce. It is a common practice done in the past and have evolved in the process of manufacturing these days.
The answer should be B.
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LSD is usually given in tab or sheet form (considering the fact that it is just chemical soaked paper). Depending on the quality one dose which is one tab should go for a around $5-$20... Please do not go using this information for the purchase of illicit substances.
