The clause <em>when we can rest </em>is a subordinate/dependent clause, meaning that it cannot stand on its own - it has to be a part of a larger, independent clause, as is the case here.
"A. You know, of course, that she used to dive for her college swim team." does not have any errors in comma usage. "Of course" is almost always surrounded by commas.
Answer
Characters include:Mathilde Loisel,Monsieur Loisel,Madame Forestier. then loses the necklace and must work for ten years to pay off a replacement. Her Monsieur Loisel is content with the small pleasures of his life but does his best to the necklace, Monsieur Loisel sacrifices his own future to help her repay the debt.
Explanation:
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I would say when he goes back to check on her to realize she has hung herself? You didn't post any options... So that is the best thing I have got.