Easy
Choose the suitable degree for the blank space - The river Ganga is ....................than the river Yamuna.
Explanation
Explanation
The word 'than' in the sentence is a clue that two things are being compared, which requires the comparative degree of the adjective, not the plain or superlative form. The comparative of 'long' is 'longer'. So the correct answer is longer, option (2).
PRO TIP
Re-check your working by substituting the answer back into the original question.