Answer:
D. When a firm purchases products in a country where prices are lower and resells them in a country where prices are higher.
Step-by-step explanation:
Arbitrage is the buying of products/commodities such as shares at a given price and (in most cases) instantly selling at a profit in a different market/country. Differences in exchange rates are often exploited in the execution of an arbitrage to make a profit. Arbitrage is legal.
In other words, arbitrage can be said to occur when a firm purchases products in a country where prices are lower and resells them in a country where prices are higher.