The Answer is
South Vietnam surrendered after Saigon fell.
Sunday is correct because it’s believed to be the sabbath day
Thomas Edison created the lightbulb.
D. People with asthma or other respiratory illnesses.
This is correct because people with these issues struggle a bit more with their immune systems more than others. Their lungs and other respiratory organs can become irritated faster than those of non-asthmatic people and such in that area.