Step 1: Think about what shapes how land gets used.
Land use depends first on nature itself, things like relief, climate, soil and availability of water.
Step 2: Add in the role of people.
On top of nature, human choices like population size, technology, irrigation and government policy decide how that natural land actually gets used, for farming, settlements or industry.
Step 3: Combine both influences.
Since neither nature alone nor people alone can explain land use patterns, it is really the physical and human factors working together.
Hence, the correct answer is option (D), physical and human factors.