1. Various research centers are studying identical twins in order to discover the 'heritability' of the environment. They have reached some startling conclusions. One study found. for example, that optimism and pessimism are both very much influenced by genes, but the only optimize is affected by environment as well. According to another study, genes influence our coffee consumption, but not the consumption of tea. Anxiety seems to be 40 to 50 percent heritable. Another study tells us that happiness does not depend much on money or love or professional success. instead, it is 80 percent heritable! Among the traits that appear to be largely heritable are shyness, attraction to danger (thrill-seeking), choice of career and religious belief.
what is the main topic of the paragraph?

• A. Research centers and study of genes
• B. Research centers and study of genes
• C. Research centers and study of genes
• D. Research centers and study of genes

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