Consider the following statements:

Assertion (A) : River Damodar was known as "River of Sorrow" in west Bengal prior to the development of the Damodar Valley Corporation.
Reason (R) : Damodar in its upper reaches flows rapidly and in its lower reaches it runs too sluggishly.

Select the correct answer using the codes given below:
Codes

A) Both (A) and (R) are true and (R) is the correct explanation of (A).

B) Both (A) and (R) are true, but (R) is not the correct explanation of (A).

C) (A) is true, but (R) is false.

D) (A) is false, but (R) is true.

This MCQ is part of the UP PSC Previous Year Questions (PYQs) series, focusing on UPPSC Prelims 2010 (GS Paper I)