If a region of DNA contained numerous mismatches due to a modifying agent that caused methylation of guanine,which of the following mutagens is most likely the cause?

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Alkylating agents such as methyl nitrosourea (MNU) and ethyl methanesulfonate (EMS) can cause methylation of guanine, leading to mismatches during DNA replication. Deaminating bases such as nitrous oxide can cause substitutions, intercalating agents such as acridine orange can cause insertions or deletions, and ionizing energy such as gamma radiation can cause a variety of DNA lesions including breaks and crosslinks.

If a Region of DNA Contained Numerous Mismatches Due to a Modifying