Mr. Watson transferred the following life insurance contracts within three years of his death. Which of the following policies is not included in his gross estate?

A. A life insurance contract on his former wife that he gifted to his daughter (Mr. Watson was the contract owner).

B. A life insurance contract on his life that he gifted to his former wife, Mrs. Hudson.

C. A life insurance policy on his life that he gifted to his wife, Mrs. Watson.

D. A life insurance policy on his life that he gifted to an irrevocable life insurance trust for the benefit of his business partner, Mr. Holmes.