Today’s correct answer is “neither of whom was.” I like computer-assisted learning. Now to figure out what to do with commas.
I feel extremely pleased with myself when I’m one of the 37% of 243,289 respondents who got an answer right!
Correct commalizing is counterintuitive: if it’s done right, it appears that you’ve used either too few or too many, while the number that “feels right” usually isn’t.