Sarayu River is considered linked with which river system?

Correct answer: Ganga system

The direct answer is D, the Ganga system. Sarayu, also called Ghaghara in many geographical contexts, is a Himalayan tributary associated with the Ganga river system. It flows through the region of Ayodhya, which is why the pair Ayodhya–Sarayu is especially useful for memory. Option D is correct because the Sarayu ultimately belongs to the wider Ganga drainage network. Option A, Narmada system, is wrong because Narmada is a separate west-flowing peninsular river draining toward the Arabian Sea. Option B, Krishna system, is wrong because Krishna is a Deccan river flowing toward the Bay of Bengal. Option C, Kaveri system, is wrong because Kaveri is another independent southern river system. Do not decide only from the river’s local name; identify the larger basin to which it belongs. School texts may distinguish Sarayu and Ghaghara in naming, but its connection with the Ganga system is the accepted answer here. Memory cue: Ayodhya’s Sarayu is part of the Ganga drainage family.