(a) talus
(b) loess
(c) drift
(d) till
Answer: (d) till

Explanation: Glacial deposit soil is called till.
Glacial till (boulder clay) – Typically, a mixture of boulders, gravel, sand, silt and clay, deposited by
glaciers and not transported or segregated by water.
Loess –  A loose deposit of wind-blown silt that has been weakly cemented with calcium carbonate and
montmorillonite. Loess is formed in arid and semi-arid regions and stands in nearly vertical banks.
Colluvial soil – The accumulation of rock debris or talus at the base of a steep cliff or a rock escarpment.
Drift – All sediment of glacial origin are collectively known as glacial drift.