Step 1: Physical factors are natural features influencing regional development.
- (a) Topography: Terrain (e.g., plains, mountains) affects settlement and agriculture.
- (b) Climate: Weather patterns influence crop suitability and livability.
- (d) Water supply: Availability of water supports agriculture and habitation.
Step 2: Market (c) is incorrect, as it is an economic factor, not a physical one, related to trade and commerce.