Which sentence does not contain any errors in comma usage? a. grandma is someone, who knows how to cook effortlessly. b. steve is talking to the woman, who lives in the apartment right above ours. c. uncle frank is the one who will fix our plumbing. d. here is the firefighter, who will rescue the kitten from our tree.

The answer is the option c. Uncle Frank is the one who will fix our plumbing. There is no need to use comma. Options A, B and D, introduce a split before who that is erroneous, because the clause after who is necessary to understand the meaning. You only use comme in front of who when you are introducing a clause that is not needed to understand the meaning.

The lines for all we know could idicate she shoved a whole bag of jelly beans up her rear end. because you're a moron and trying to cheat by having classmate from your online school fill in the next time just put the dialogue in the question too. thx for the points.