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The correct answer is option B, i.e., airplanes. Airplanes are used to travel a very long distance in a very short time. They are expensive, but the fastest means of transport. Trains are also fast means of transport, but less fast than airplanes. Trains are a relatively cheaper mode of transportation.
Vitamins or life essence are the components of food, which all the organisms require in small amounts.Their deficiency leads to incompleteness diseases. These are chemically organic compounds. Vitamin is called compound which can not be produced by the body in sufficient quantity but it is necessary to take it as a food.
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