Some Studies Have Shown That Eating Chocolate Before a Test

Some studies have shown that eating chocolate before a test can increase brain activity,thereby causing students to score higher on exams.When these findings were announced,the price and quantity sold of chocolate increased in college towns.One reason for this could have been that the

A) producers increased their supply of chocolate.
B) consumers increased their demand for chocolate.
C) producers increased their supply of chocolate and consumers increased their demand for chocolate.
D) producers decreased their supply of chocolate.
E) consumers decreased their demand of chocolate.