so judging by the last two questions we are just supposed to guess things that aren't mentioned by the actual sentence? nowhere does it say anything about cheese or baked goods. This again, is unsubstantiated hypothesis and I am confused why it is correct.

Unsure how C is correct answer when the questions never once mentions them drawing calcium from another source that is not accessible by sugar maples. Isn't that just a hypothesis that is not supported by the argument?