(a) Conglomerate
(b) Arkoses
(c) Syenite
(d) Schist

Ans :- (c) syenite

Igneous rock :-
It is also known as primary, unstratified or eruptive rocks are of volcanic origin and are formed as a result of solidification of molten mass lying below or above the earth’s surface.
The example are granite, syenite, diorite and gabbro.