Bertam Transfers Property with a $50,000 Mortgage,a Fair Market Value

Bertam transfers property with a $50,000 mortgage,a fair market value of $350,000,and a basis of $200,000 for stock valued at $300,000.If the corporation assumes the mortgage,what is Bertram's basis in the stock received in this qualifying Section 351 transaction?

A) $200,000
B) $250,000
C) $300,000
D) $350,000
E) None of the above