Identify a Common Way in Which a Market Dominating Firm

Identify a common way in which a market dominating firm that practices price discrimination prevents the arbitrage of its products across various markets.

A) Pricing its products identically despite huge differences in demand across different markets
B) Differentiating otherwise identical products among nations along some line,such as design or packaging
C) Adopting a pricing strategy matching what competitors charge in each of the different national markets
D) Limiting sales of its products to only a few nations