Nicole and all of her co-workers wear blue uniforms. Andrew works with Nicole. Olivia does not wear a blue uniform. Everyone who wears a blue uniform also wears a white shirt . Which statement must be true?

A. Olivia wears a white shirt
B. Olivia does not work with Nicole
C. Some of Nicole's co-workers do not wear white shirts
D. Olivia is a co-worker of Nicole
E. Nicole does not wear a white shirt