Concept:NISAR is an Earth observation satellite jointly developed by NASA and ISRO.
It uses a polar sun-synchronous orbit to maintain consistent lighting for radar imaging.
Explanation:A polar sun-synchronous orbit ensures the satellite passes over any given area at the same local solar time.
This provides consistent sunlight conditions, essential for high-quality radar observations.
The orbit is typically 600–800 km in altitude and crosses near the poles.
As Earth rotates, NISAR covers the entire surface, enabling global monitoring.
This orbit is ideal for tracking earthquakes, tsunamis, glaciers, forest biomass, and climate change.
Other orbit types like GEO or GTO are not suitable for such detailed Earth observation.
Thus, NISAR is deliberately placed in a polar sun-synchronous orbit.
Answer:Polar sun-synchronous orbit (Option C)