As it is presented in the passage, the approach to history taken by mainstream U.S. historians of the late nineteenth...

Hi! While I was working out question 13 I did not arrive to answer choice C because I noticed a missing comma between York and Victoria. The first rule stated they all arrive one at a time so I thought this was a trick answer. Could anybody clear this up because it is driving me crazy!? Not sure if it was a typo or if I need to get my lenses checked again!