Correct Answer: House : Room

Solution : Given:
Cart : Wheel :: ? (This depicts the relation between an object and its component or part, the wheel is a component or part of the cart.)

First option: House : Room; The room is a component or part of the house.
Second option: Chapter : Book; the book is not a component of the chapter but, the chapter is a part of the book.
Third option: Pedal : Bicycle; The bicycle is not a component of the pedal but, the pedal is a component of the bicycle.
Fourth option: Student : Class; the class is not a part of the student but, the student is a part of the class.

So, only the first option follows the same pattern as followed by the given pair. Hence, the first option is correct.