Suppose That in Montreal in December,2018,10 000 Ski Helmets Were

Multiple Choice

Suppose that in Montreal in December,2018,10 000 ski helmets were sold at a price of $60 each.And in Montreal in December,2019,20 000 ski helmets were sold at a price of $80 each.One possible explanation for the change is that,ceteris paribus,from 2018 to 2019 the ________ curve for ski helmets shifted to the ________.

A) supply; left
B) supply; right
C) demand; left
D) demand; right
E) supply or demand; right