(a) Lime
(b) Clay
(c) Sand
(d) None of these
Ans :- (b) Clay

Explanation :- 
Argillaceous rock – Argillaceous rock undergo most change as they are composed of
chemically complex clay minerals such as kaolinite, illite, smectite, bentonite and montmorilinite.
Exp- Slate, Laterite, Schist etc.
Its brittle and this can’t carries impact loading.