PLEASE HURRY please pick one answer from below

What invention increased trade to the East and allowed for safe travel over long distances?
0 Grand Canal
0 Silk Road
0 woodblock printing
0 magnetic compass

As nina and erin were eating lunch in the central high school student cafeteria, they were discussing the news coverage about the girls' athletic coach being arrested for selling steroids to student athletes. "i think the guy just did it because they don't pay teachers enough money," nina suggested. "i bet the guy had some other kind of drug addiction he was trying to pay for," erin countered. nina and erin's ideas about the cause of the coach's drug-selling behavior are examples of: