Under which one of the following rivers has India's first underwater metro rail tunnel been constructed?

  1. A. Yamuna
  2. B. Ganga
  3. C. Hooghly
  4. D. Gomti

Correct Answer: C. Hooghly

Explanation

India's first underwater metro rail tunnel forms a part of the East-West Metro Corridor of Kolkata, running under the Hooghly River.

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