Step 1: Exiled Location of Lord Ram (First Night).
As per the Ramayana, Lord Ram's initial night of exile was spent adjacent to the Sarayu River.
Step 2: Evaluation of Possible Rivers.
- (A) Ganga River: Lord Ram's first night of exile was not spent by the Ganga River.
- (B) Sarayu River: This option is accurate; Lord Ram's first night in exile occurred at the Sarayu River.
- (C) Tamsa River: Lord Ram did not spend his first night in exile at the Tamsa River.
- (D) Subarnarekha River: This river has no association with Lord Ram's exile.
Step 3: Determination of Correct Answer.
The accurate choice is (B) Sarayu River.