It is speculated that which process, which affects gene activity level without altering the genetic sequence, could be responsible for gene-environment interactions like the one Caspi et al. (2002) observed for MAOA?

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Epigenetics refers to chemical modifications of DNA and histones that affect gene activity levels without changing the underlying genetic sequence. This process can be influenced by environmental factors and could explain the gene-environment interactions observed in studies like that of Caspi et al. (2002). The other choices (A-D) refer to genetic factors that involve changes to the actual DNA sequence and are not as directly related to environmental influences.

It Is Speculated That Which Process, Which Affects Gene Activity