Yeah, you definitely don't want to be translating answer choices under time. JY is only doing that to make the videos as concise as possible. That's not meant to be something you should do on the actual test.
This question really pissed me off. I tried translating the premises using symbols and did not get the same sufficient assumption as the answer choice. Drove me insane.
As long as you are translating it correctly, I don't think it really matters. I am more group 3 person as well because I like to get the rule-induced negation out of the way first.