Options are not given in the question, so here are the options;
a.) the electricity used at the park
b.) the mechanics who maintain the equipment
d.) the roller coaster
c.) the ticket-take
from these options, the correct option is "d.) the roller coaster".
An amusement park refers to the park which highlights different attractions, for example, rides and diversions, and also different occasions for enjoying and entertaining purposes. An amusement park is a sort of entertainment place that bases its structures and attractions around a central theme, frequently including various regions with various subjects.