(a) volcanic and plutonic
(b) mechanical, chemical, organic
(c) intrusive, extrusive
(d) stratified, un-stratified
Ans :- (b) mechanical, chemical, organic

Explanation :-
The main types of sedimentary rocks are mechanical chemical and organic.
• Chemical sedimentary rocks formed by the crystallization of chemical precipitates. Ex. Limestone.
• Organic sedimentary rocks are when shells are cemented together they make a type of limestone. So, limestone can be considered chemical or organic.