Ordering of Sentences - Verbal and Reasoning

Directions to SolveIn questions below, each passage consist of six sentences. The first and sixth sentence are given in the begining. The middle four sentences in each have been removed and jumbled up. These are labelled as P, Q, R and S. Find out the proper order for the four sentences.
Q1:

S1: Your letter was big relief.
P : How did you exams go?
Q : After your result, you must come here for a week.
R : You hadn't written for over a month.
S : I am sure you will come out with flying colours.
S6: But don't forget to bring chocolate for Geetha.
The Proper sequence should be:

A PSRQ

B QRPS

C RPSQ

D RSPQ

ANS:C - RPSQ

No answer description is available.