I believe the correct answer is morose, the definition of morose is "sullen and ill-tempered" therefore it seems to fit with those words the best. I believe choice A is your best option.
A. B-there should be a comma after June 4 (June 4, 1968) C-there should be a comma after Paris (Paris, France) D-there should be a comma after Church (Falls Church, VA) :)