Parts of a sentence are given below. The first part (O) is in the correct order, while the other parts of the sentence are jumbled up. Arrange the parts in the correct order to form a meaningful and coherent sentence. (O) Whereas the traditional study of regional dialects (P) that is mainly used to define groups of speakers as having something in common (Q) tended to concentrate on the speech of people in rural areas, (R) the study of social dialects has been mainly concerned with speakers in towns and cities (S) in the social study of dialect, it is social class.

1. QSRP
2. PQRS
3. PQSR
4. RSPQ