Lucy was a sole proprietor of playtime and amusement park. The main attraction of the amusement park was a very steep and faster roller coaster Lucy maintained the roller coaster, but she knew that it was unsafe for riders under 4 feet tall she instructed her employee Oscar not to permit anyone less than 4 feet tall to the ride on the roller coaster on a particular busy day in June Oscar forgot his instructions and allowed several children below 4 feet tall ride the roller coaster one child was thrown from the ride and suffered serious bodily injury Lucy is liable under respondent superior, not liable since the child voluntarily not liable since she maintained the roller coaster, not liable because she properly instructed her employee