Explanation:

- Option 1: Swaraj Tunnel - "Swaraj" symbolically represents self-rule, a concept heavily attributed to the Indian independence movement, but not relevant here.

- Option 2: Bose Tunnel - "Bose" likely refers to Subhas Chandra Bose, a prominent leader in India's freedom struggle, but no significant tunnel has been named after him recently.

- Option 3: Mukherjee Tunnel - "Mukherjee" might refer to Syama Prasad Mukherjee, a notable Indian politician. However, this option is incorrect for the Rohtang passageway.

- Option 4: Atal Tunnel - This is the correct answer. Named after former Indian Prime Minister Atal Bihari Vajpayee, it reflects his contributions and leadership.

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