Why do companies decide to enter a foreign market?

a$.$ to exploit the natural resources found within its home market

b$.$ to capture economies of scale in product development, manufacturing, or marketing

c$.$ to concentrate risk within a broader base of countries, especially when sales are down in one area and the company can undermine sales elsewhere

d$.$ to decrease the rate at which they accumulate experience and move up the learning curve

e$.$ to raise input costs through greater pooled purchasing power