The correct option is D All of the above
Relief refers to the terrain in a particular region. India has snow-capped mountains, plateaus, plains and deserts. So, vegetation found in each of these places would be different.
The undulating and rough terrains are where you would find the woodlands. The hot and dry sandy stretches are home to vegetation that are more adapted to withstand high temperatures.
The type of soil found in a place also has an effect in the kind of vegetation found. The sandy soil of the Great Indian Desert is suitable for cacti and thorny bushes. The swampy deltaic soils in the Sunderbans support mangroves and deltaic vegetation.
Climate also dictates the character and extent of vegetation found in a place.