1. The factors that may affect the likelihood of an snow avalanche are:

1. Slope Steepness
2. Slope Orientation
3. Weather and temperature conditions
4. Direction of the Wind
5. Terrain and Vegetation
6. Snowpack Conditions
   1. i,iii,iv,v and vi only
   2. All of the above
   3. ii,iii,iv,v and vi only
   4. i,ii, iii and vi only

Answer :

b, Snow Avalanches: https://nsidc.org/cryosphere/snow/science/avalanches.html