Explanation:

- Option 1: Emil Jannings

- Emil Jannings was the first actor to win an Oscar.

- He received the Best Actor award at the first Academy Awards in 1929.

- His performances in "The Last Command" and "The Way of All Flesh" earned him this honor.

- Correct Answer.

- Option 2: Warner Baxter

- Warner Baxter won the Oscar for Best Actor the following year in 1930.

- He received this for his role in "In Old Arizona."

- Option 3: Charlie Chaplin

- Charlie Chaplin received an honorary award at the first Oscars.

- He was recognized for versatility and genius in acting, writing, directing, and producing.

- Option 4: Lionel Barrymore

- Lionel Barrymore won the Best Actor Oscar in 1931.

- He was awarded for his performance in "A Free Soul."