A deterioration of adolescents mental health over the past 25 years has been reported. The rate of emotional problems such as anxiety and depression has increased by 60% among teenagers. Girls in particular are more likely to suffer emotional problems but the rate at which these problems have increased is far higher among boys. The increase is not explained by the increase in single parenthood. The increases were found across all types of family. Nor can the deterioration be put down to greater inequality, as again the rate of problems reported was consistent across social class. No differences were found in racial origin using a representative sample of adolescents suffering these problems from all the major ethnic groups.

Question: The possible causes of the sharp decline in teenage health are not considered.
Options:
A. true, B. false, C. uncertain
Answer: "B"