Parts of a sentence are given below. While the first part (S1) is in the correct place, the remaining parts (labelled P, Q, R and S) are jumbled up. Arrange the parts in the correct order to form a meaningful and coherent sentence. S1. It's raining heavily (P) due to the waterlogging (Q) which makes commuting difficult (R) and traffic is moving slowly (S) so roads are flooded

1. SQRP
2. RSQP
3. SRQP
4. PQRS