The alpine vegetation in the western Himalayas is found only up to a height of 3000 meters while in the eastern Himalayas it is found up to a height of 4000 meters. The reason for this variation in the same mountain range is that

• A. eastern Himalayas are higher than western Himalayas
• B. easternHimalayas are nearer to the equator and sea coast than westernHimalayas
• C. easternHimalayas get more monsoon rainfall than the westernHimalayas
• D. easternHimalayas rocks are more fertile than the westernHimalayas rocks