A) Industry
* Image: A bustling factory with smoke billowing from its chimneys and workers moving around.
* Explanation: The image signifies the production and manufacturing processes that define industry.
B) Urban
* Image: A cityscape with towering skyscrapers, busy streets filled with cars and people, and brightly lit signs.
* Explanation: This evokes the densely populated, developed environment characteristic of urban areas.
C) Enigma
* Image: A locked chest with intricate carvings, surrounded by swirling mist and shadows.
* Explanation: The locked chest represents something mysterious and hidden, symbolizing the difficulty of understanding an enigma. You might also imagine a person's face partially obscured by shadows, leaving their true nature unclear.