In which, if any, of the following independent situations has Trent made a gift?

Trent established a $500,000 irrevocable trust, income payable to himself for life and, upon his death, remainder to his children.

Trent dies owning a $100,000 U.S. savings bond with ownership listed as: Trent, payable to Sue on Trents death. Sue redeems the bond.

Trent sends $25,000 to Alices oral surgeon in payment of her dental implants. Alice is Trents sister and does not qualify as his dependent.

During the current year, Trent contributes $200,000 to the Republican Party convention and $200,000 to the Democratic Party convention.