I agree with others about A. Perhaps the gag would've been funnier in a longer extract, but it just felt quite flat here. B is okay but not particularly memorable slapstick. You can't help thinking how much more Laurel and Hardy or even someone like Michael Crawford would have done with a similar scenario. It does work better as a self contained clip though.
Christ, we're dining on thin gruel today. A seems pointless, randomly chosen. The first part of B is dreary, and the second part is one of the worst comedy runaway-train setups I've ever seen; badly directed, edited, and not funny at any point. Makes me long for Norman Wisdom, which isn't something you'll hear me say often.
No prizes for guessing who picked B. I remember Get Smart from my gilded youth, although I've never seen it in colour before. . Always raised a chuckle. It wins easily here, with half a dozen pieces of decent slapstick against a not particularly good one-liner.