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A recent report shows that the number of teenagers sniffing toxic inhalants has decreased although the subject continues to trouble parents.
This answer choice is grammatically incorrect. The article the amount of can describe non-count nouns only whereas the noun teenagers is a count noun.[[snippet]]
This answer choice is stylistically flawed. Using the passive form (parents are continually being troubled by) creates Redundancy. Since there is another grammatically correct answer choice that does not use the passive form, it is preferable to this one.
This answer choice correctly matches the article the number of with the count noun teenagers.