Concept:
A Sponge City is an urban planning concept designed to improve rainwater absorption, storage, and reuse within urban areas.
The concept focuses on:
• Increasing green spaces,
• Preserving wetlands and water bodies,
• Reducing urban flooding,
• Enhancing groundwater recharge,
• Promoting sustainable stormwater management.
The city behaves like a sponge by absorbing and retaining rainwater naturally.
Step 1: Understand the Sponge City concept.
A Sponge City includes:
• Parks and urban green belts,
• Lakes and ponds,
• Permeable pavements,
• Rain gardens,
• Green roofs and wetlands.
These elements help retain and manage rainwater effectively.
Step 2: Analyze the given options.
• Sponge city -- Urban area designed to absorb and retain rainwater using green spaces and water bodies. \checkmark
• Industry city -- Focused on industrial activities and manufacturing.
• Satellite city -- Smaller city developed near a major urban center.
• Aerocity -- Urban development centered around airports.
• Green city -- General term for environmentally friendly cities but does not specifically define rainwater retention systems.
Therefore, the correct answer is:
\[
{A}
\]