The length of the Dhola – Sadia bridge inaugurated in May 2017 is around

The correct answer is D) 9.15 km. The Dhola-Sadia bridge was inaugurated by PM Modi on 26 May 2017. It crosses the Lohit river, a tributary of the Brahmaputra, and links Dhola in Assam with Sadiya in Arunachal Pradesh. At 9.15 km it was then the longest river bridge in India.

Why the others fail:

• A) 12.15 km and B) 11.15 km are inflated figures. Nothing in the project's specifications supports them.
• C) 10.15 km is close but still wrong. The sequence 9.15, 10.15, 11.15, 12.15 is a deliberate ladder of distractors, so only the exact figure is accepted.

The core concept is the Bridge-based connectivity of the North-East under the Act East Policy. The bridge shortened the Assam-Arunachal travel time considerably and strengthened defence logistics along the frontier, which makes it a good example for Mains answers on infrastructure and regional integration.

Note that the bridge has since been renamed Bhupen Hazarika Setu, so answers mentioning the old name should also carry the new one.

Trap: aspirants pick a figure that looks plausible without checking the exact value. Memorise the 9.15 km figure alongside the river and the two states it connects.