What can we learn from Paragraph 4?

A.People with two different MAOA genes run a greater risk of carrying debt than those with two low MAOA genes. B.How much MAOA can be produced by brain cells depends on what versions of MAOA genes a person has. C.People with two high MAOA genes are less likely to make ends meet than those with two different MAOA genes. D.How much MAOA can be produced by brain cells is related to how many MAOA genes a person has.

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