Consider the following features about a geographical phenomenon : 1. Torrents of snow and ice roaring down a steep mountainside 2. It is hazardous to skiers and mountaineers 3. It involves a mix of falling, rolling, sliding and flowing of materials Which of the following phenomena can be identified with the above features?

a. Slump and earthflow
b. Avalanche
c. Landslide
d. Rockslide