Q15- Which one is the answer? Thanks

QUESTION 15 A foreign firm exporting to the U.S. cannot be accused of dumping if: O 1. it sells its product in the U.S. at a price below its production costs 2. it sells its product in the U.S. at a price below what U.S. firms charge O 3. it sells its product in its home market at a lower price than in the U.S. 4. it sells its product in the U.S. at a higher price than U.S. firms charge 5. it both imports products to the U.S. and produces products in the U.S