I'm still unclear why A is more wrong than C. It seems like they both require some stretches of inference and the explanation didn't help me understand why A was the "wrong" kind and C was the acceptable (albeit not great) kind. Clarification?

Well when you're an LSAT master, you can create your own program and curriculum without curse words. In the meantime, these people are the masters and they can do what they want. They've earned it.

Or maybe helpful if you're stuck between two answers and a quick visual will help break the confusion.

In the last example (with Jon), there's a 'must' in there too. Is 'must' not an indicator for a necessary condition? How we do know to follow the plan for the 'or' instead of the 'must'?