The people who have high self esteem
A. Stretching
because stretching is making something be able to go longer or wider without breaking. <span />
Social conformity can peer pressure you, self discipline can influence you do date or not deciding on what you believe you deserve. And impulse versus delayed gratification can influence you by making drastic and not very though out decisions.
The answer is C because transportation regulation is going to prevent overcrowding and therefore help with good hygiene. this prevents the spread of germs.