Louise, who died in January 2013, was survived by her husband, Larry. Louise's gross estate was equal to $6,000,000 on the date of death. When Louise died, Louise and Larry owned an undeveloped parcel of real estate in Ocala. The fair market value of the land on the date of Louise's death was $750,000. Larry provided all of the consideration for the purchase of the land, paying $200,000 for it in 2010. Alternate valuation is not available to Louise's estate as all assets owned by Louise will pass, either under Louise's last will and testament or by operation of law, to Larry and hence, no estate tax will be due because of the marital deduction. What is the amount, if any, includible in Louise's gross estate for federal estate tax purposes with respect to the land?

a. 0.

b. $200,000.

c. $375,000.

d. $750,000.