I wonder how the maker of this quiz defines common sense. To me it seems more like a logic puzzle and trick questions.

Apparently common sense is having sound judgment in practical matters.

The one that was a bit hard for me to answer was the widow one. Even though the husband is dead, the widow's sister could marry him, and since marriage is a team effort he will be marrying her. It depends on the laws of a particular place.

The man could have also faked his death or just left his wife for her sister. It did not say that the man was actually dead.