This Quiz focuses on 'these Questions of ours', as examples of expressing Demonstratives ('this/that' etc.) and Possession, in various combinations ~ so as to make sure you can pinpoint items and their owners, in order to avoid any potential embarrassment.
There is only one letter of difference between Answers 3 and 4, and 'we' are clearly keen to hear about the young man, but Answer 4 really does not make such plausible sense!