Identify the part which has an error in it.
We are / in the final stage / of resolving the border dispute / among the two states.

Correct option is D

Error part: (d) among the two states
Correct phrase: between the two states
Detailed explanation:
• Between is used for two persons/things when we talk about a relationship, division, agreement, dispute, etc.
• Among is used for more than two persons/things.
• Here, “two states” = exactly two, so between is correct.
Correct sentence: We are in the final stage of resolving the border dispute between the two states.
Grammatical rule (English):
• between → used for two; among → used for more than two.
व्याकरणिक नियम (Hindi):
• between = दो के बीच, among = तीन या अधिक के बीच।
Meanings (Hindi support):
• between the two states = दो राज्यों के बीच
Hence, option (d) is the correct answer.