What does a blue sign mean?

Answer: C — Directional sign

A blue sign typically indicates a directional sign, providing information such as directions, locations, and distances. Warning signs would typically be yellow or orange, signaling potential hazards. Regulatory signs are often white, providing instructions for drivers, such as speed limits or parking regulations. Performance signs, on the other hand, are typically found in sports and entertainment venues, displaying scores or information related to a performance. Therefore, based on the common meanings associated with different sign colors, the most appropriate answer for a blue sign would be a directional sign.