Isn't MC 5 A)?
I put the option that had I and III only (this is the amino acid question right?). It couldn't be II because that would state that hydrogen bonds could occur between any C=O and N-H functional groups, and I found some amino acids that had those functional groups in their side chains.
How much do you think we could have dropped on this exam to be still in the running for a 50? I think I've stuffed up on one question, that stupid solubility one. It was annoying because technically some PbI2 was still dissolved in solution, though it's correct to state you can't really calculate because you don't know how much KI was added. Dumb question.