In the question below, there is a sentence of which some parts have been jumbled up. Rearrange these parts which are labelled P, Q, R and S to produce the correct sentence. Choose the proper sequence.

The appearance

P : this dinosaurs were at their peak

Q : of the first mammals on the earth

R : at the time when

S : went almost unnoticed

The Proper sequence should be:

A.

SRPQ

B.

QSRP

C.

QRPS

D.

RPQS

Correct answer is C

No explanation has been provided for this answer.