Why Would a Firm Establish a Sales and Service Infrastructure

Why would a firm establish a sales and service infrastructure in a country where it wanted to sell its products?

A) Establishing an infrastructure in a country is the easiest way to develop a market for the products in that country.
B) Establishing an infrastructure in a country may be necessary if the product being sold requires after-sale service.
C) Establishing an infrastructure in a country is a long-term strategy that promises the most success for the firm.
D) Establishing an infrastructure in a country is the only way to gain the exposure necessary to successfully sell the firm's products.