Which of the following features gave Gustav Klimt's figure paintings a Byzantine look?

A. Soft lines and long brushstrokes B. Geometric forms C. An organic rhythm D. Flat figures and gold highlights

The best answer is D) Flat figures and gold highlights.

Byzantine art was known for its splendor and use of gold, and for its flat shapes. While Klimt's work distinguished itself in many elements of style, especially subject matter, from Byzantine art, many of his works during his Golden Period featured these two elements.