Stacey Inherits Unimproved Land (Fair Market Value of $6 Million)

Stacey inherits unimproved land (fair market value of $6 million) from her father on June 1, 2019. She disclaims her interest in the property as follows: one-third on December 1, 2019; one-third on January 3, 2020; and the remaining one-third on May 31, 2020. In all cases, the disclaimers pass the interest to her son (the next heir under state law) . The Federal gift tax applies to Stacey for:

A) All of the disclaimers.
B) The disclaimer made in 2019.
C) The May 31, 2020 disclaimer.
D) All of the disclaimers made in 2020.
E) None of the disclaimers.