【单选题】Which of the following statements about a trade bloc is accurate?
A.
a. The gains from a trade bloc are shared equally by each member.
B.
b. Increased competition within a trade bloc can result in higher commodity prices in the domestic markets of the member countries.
C.
c. A trade bloc may lower firms’ costs by allowing them to exploit economies of scale.
D.
d. A trade bloc can increase the opportunities for domestic business investments but usually repels foreign direct investments into the member countries.