Does the sentence "During daylight activity or marching, soldiers were to remain motionless if an aircraft appeared, until it flew away; PVA officers were under order to shoot security violators." provide a valid answer to the question "What made seeing the PVA units difficult during the day?"

A: no

Does the sentence "Test cases are built around specifications and requirements, i.e., what the application is supposed to do." provide a valid answer to the question "What are the test cases built around?"

A: yes

Does the sentence "The entire lake bed is now paved over and most of the city's remaining forested areas lie in the southern boroughs of Milpa Alta, Tlalpan and Xochimilco." provide a valid answer to the question "Where are most of the trees located in Mexico City?"

A: yes

Does the sentence "In previously years mostly all efforts to conduct any large-scale renovations to the field had been opposed by the city, former mayor Richard M. Daley (a staunch White Sox fan), and especially the rooftop owners." provide a valid answer to the question "When did Tom Ricketts and Crane Kenney unveil plans for a five-year funded renovation of Wrigley Field?"

A:
no