A tech job in options-MM is what I used to have and it's really not that great a job. I wouldn't be surprised if you were interviewing for my old job.
I would've just said, "Get a job with an options MM firm, steal their edge, raise capital, and do it somewhere else." It's not like these people invented all the technology behind their pricing systems. They need to get off their high horse and STFU.
And these BS questions are usually just to test whether you're a weasely shit or someone who can deal with the office politics. Honestly, traders want people they can push around -- not people they will/can educate. If you're assertive, you would've questioned him for details and pushed him into revealing the answer, because that's how it works on a trading floor. You can't read his mind, so question the bastard.
I'm tired of tech people getting pushed around like this trying to break into the trader role. Stop kissing these people's asses or trying to please them. You tell him you want 200k minimum with a 50k minimum base bonus and THEN you'll tell his ass how to make money in options, because that's when it becomes worth your while to conduct the search.
F these people. And I bet your base pay would've been like $150k to maybe 175k. At the end of it all, you would have been writing bullshit perl scripts to pull down reports from the exchanges after all the non-sense.