Some parts of the sentence have been jumbled up. You are required to rearrange these parts which are labelled P,Q,R and S to produce the correct sentence . Choose the proper sequence and mark in accordingly.
Based firmly on current lexical and learning theory
`("not only to present and to explain words")/(P)`, `("English Vocabulary in Use aims")/(Q)`, `(" and to help them work out the rules themselves")/(R )` , `("but also to show students how to use them")/(S)`.
The correct sequence should be

Options

A. QPRS
B. QPSR
C. RQPS
D. PSQR