The following sentences (1, 2, 3, 4, 5) form a paragraph. The first and the last sentences are given. Choose the order in which the three sentences (PQR) should appear in S2, S3 and S4, to complete the paragraph:
S1: The Diwali festival is one of the most important Indian festivals.
S2: _______________________________
S3: _______________________________
S4: _______________________________
S5: So the people of Ayodhya illuminated the whole city.
P: It is celebrated with great enthusiasm and excitement all over India.
Q: It is a festival of lights.
R: It is celebrated in honor of the return of Lord Rama to Ayodhya after fourteen years' exile.