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Directions: Read the passages given below and answer the questions that follow. PASSAGE-2 Many people think that it is harmful to keep flowers and plants in a sick room, especially overnight. There is some reason for this belief. At night plants breathe oxygen, as we do ourselves. The amount of oxygen that plants use is small, however, and is not likely to affect the supply of air in a modern, well-ventilated sick room. A more serious objection is that flowers with a strong scent may annoy a sensitive person. When we remember the delight that flowers usually bring to most invalids, there seems to be little reason to banish them unless there should be an exceptionally large number.

Plants breathe oxygen:

A)  through their roots

B)  in well-ventilated rooms

C)  in a large quantity

D)  after sunset