In International Trade, When We Say That Brazil Is "Dumping

In international trade, when we say that Brazil is "dumping" in the United States, this is indicating that:

A) Brazil is profiting from tariffs placed on U.S. goods.
B) Brazil's firms can produce goods at lower cost than U.S. firms can.
C) Brazil's firms are selling goods at prices below what they charge in Brazil or below their production costs.
D) Brazil's firms are selling goods at prices below the cost by which U.S. firms can produce that same good.