Some cleaning fluids, synthetic carpets, wall paneling, and other prod

Some cleaning fluids, synthetic carpets, wall paneling, and other products release toxins, such as formaldehyde and benzene, into the household air supply. This is not a problem in well-ventilated houses, but it is a problem in houses that are so well insulated that they trap toxins as well as heat. Recent tests, however, demonstrate that houseplants remove some household toxins from the air and thereby eliminate their danger. In one test, 20 large plants eliminated formaldehyde from a small, well-insulated house.

Assume that a person who lives in a small, well-insulated house that contains toxin-releasing products places houseplants, such as those tested, in the house.

Which one of the following can be expected as a result?
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(A) There will no longer be any need to ventilate the house. This is out of context. placing such plants will reduce the toxin levels, but will not exclude the possibility to further ventilate the house. the plants are not an alternative to ventilators in the house.

(B) The concentration of toxins in the household air supply will remain the same. It is already said that placing such plants will reduce the toxin levels. This is not the expected answer.

(C) The house will be warm and have a safe air supply. Placing such plants may lead to a warm and safe air circulation in the house, but this may be over assumed from the premise which only says that plants reduce concentration of toxin levels

(D) If there is formaldehyde in the household air supply, its level will decrease.A fair answer which does not over assume anything different from the premises given. Stay with D.

(E) If formaldehyde and benzene are being released into the household air supply, the quantities released of each will decrease. This is similar to D but, in the last sentence of the stem it is given that '20 plants reduced formaldehyde levels in the small, well-insulated house'. And,it is particularly mentioned to confuse you that the 'same' houseplants are kept in the next house. There is no mention about the reduction in benzene levels.

The final answer is D.
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