There were two small rooms in the beach house,______served as a kitchen.A.the smaller of themB.the smallest of which C.the smaller of which

There were two small rooms in the beach house,______served as a kitchen.A.the smaller of them
B.the smallest of which C.the smaller of which

C.the smaller of which

C
因为这里是两间房间，所以用比较级表示，两者之中较小的那一间。