I believe the answer is humor.
This is because, the mood of danger is shown because of policemen meaning something bad might or could have happened. The mood of mystery is shown because you do not know where the man is, or why the policemen is there. Suspense is shown because the man speaks up quickly.
I hope i didn’t miss anything but here are the edits!
C. It killed nearly 80% of the population
Gertrude Stein, patron of the arts, was a voluble conversationalist when artists and writers visited her Paris apartment in the 1920s and 1930s.
Form google dict., voluble means <em></em><span><em>Speaking or spoken incessantly and fluently.</em></span>
