The correct answer is B) the North Vietnamese and Vietcong's war strategy was to avoid defeat until the Americans gave up.
They were always on the retreat and resorted to guerrilla warfare. They would hide, attack at night, set traps, and other similar tactics until they completely demoralized the American army.
The answer is C because transportation regulation is going to prevent overcrowding and therefore help with good hygiene. this prevents the spread of germs.
Answer: tripping opponents
Explanation: when a opponent falls on their head the helmet is pushing up against their brain which can cause brain damage
Hope this helps