In 2019, Thalia purchased land for $900,000 and lists title in the names of her daughters as follows: “April and Theresa, joint tenants with right of survivorship.” In 2020, April and Theresa purchase an apartment building for $1 million as equal tenants in common; April furnished $400,000 and Theresa furnished $600,000 of the cost. April died before Theresa in 2021 when the land is worth $1.5 million and the apartment building is worth $2 million. One of the results of these transactions is:

a. April made a gift to Theresa of $100,000 in 2020.

b. None of the land is included in April’s gross estate.

c. April’s gross estate includes $800,000 (40% × $2 million) as to the apartment building.

d. April’s gross estate includes $1,750,000 as to these properties.