The correct option is C 2400
<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}-->
From west to east, the Himalayas stretch about 2400 kilometres. On the western side in Kashmir, the width of the Himalayas stretches over 400 km. On the eastern side, in Arunachal Pradesh, the width of the Himalayas is significantly less - around 150 kilometres.