(a) Mechanically formed sedimentary rock
(b) Igneous rock
(c) Chemically precipitated sedimentary rock
(d) Metamorphic rock
Ans :- (c) Chemically precipitated sedimentary rock

Explanation :-
Chemically precipitated (Chemical) sedimentary rocks are those such as gypsum and halite
and some limestone which four direct precipitation (crystallization) of the dissolved ions in the water.
• In this the dissolved ions encounter supersaturated conditions they come out of solution and combine together forming an orderly arrangement of atoms. They are said to precipitate go from the liquid, dissolved state to the solid crystal state