I saw a practice SAT question on Khan Academy:
Certified Executive Chef Hilary DeMane has prepared confections for celebrities, governors, and even Ronald Reagan.
The correct answer is filled in and in boldface. While I find this correct answer most natural, I wonder when it is permissible to add a comma between the adverb and the noun of the last member of the series. I understand that the following is incorrect:
... governors, and even, Ronald Reagan.
But this, with a comma between the adverb "importantly" and "interest rates", seems natural to me:
Factors that affect bond prices include inflation, credit ratings, and most importantly, interest rates.
Or is the above not correct either? Should there be a comma before between "and" and "most importantly" as well in order to make it grammatical?
Factors that affect bond prices include inflation, credit ratings, and, most importantly, interest rates.