ForCo, a foreign corporation not engaged in a U.S. trade or business, recognizes a $3 million gain from the sale of land located in the United States. The amount realized on the sale was $50 million. Absent any exceptions, what is the required withholding amount on the part of the purchaser of this land?

a. $0

b. $5 million

c. $3 million

d. $300,000