Which of the Following Is True of Dumping

Which of the following is true of dumping?

A) Dumping decreases the supply available in what is likely an already depressed market,further increasing prices and the likelihood that domestic producers will be able to survive.
B) Where dumping is proved,tariffs are added to the price of dumped products to discourage the practice and even the playing field.
C) Dumping occurs when goods are sold above their production costs.
D) Dumping happens most frequently in industries where there are low fixed costs.