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: We now know that the oceans are very deep.
P : For example, the Indian ocean has a range called the Indian Ridge.
Q : Much of it is fairly flat.
R : However, there are great mountain ranges as well.
S : On average the bottom is 2.5 miles to 3.5 miles down
S6: This reaches from the India to the Antarctic.
The Proper sequence should be:

A SQPR

B PQSR

C RSQP

D QPRS

ANS:A - SQPR

No answer description is available.