What type of mutation most likely results from the alkylation of the oxygen on position 6 of guanine base producing O⁶-methylguanine?

Question

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The alkylation of the oxygen on position 6 of guanine base resulting in the formation of O⁶-methylguanine is a chemical modification that causes a transition mutation. Specifically, a transition occurs when a purine (A or G) is replaced by another purine or when a pyrimidine (C or T) is replaced by another pyrimidine. In this case, guanine (a purine) is replaced by methylguanine (a purine) due to alkylation.

What Type of Mutation Most Likely Results from the Alkylation