Gabriela said, “I can’t possibly finish my work by five o’clock.”

A. Gabriela said that she can’t possibly finish her work by five o’clock.
B. Gabriela said that she won’t possibly finish her work by five o’clock.
C. Gabriela said that she couldn’t possibly finish her work by five o’clock.
D. Gabriela said that she hadn’t been able to possibly finish her work by five o’clock.