Which of the following is in geographical proximity to Sri Lanka?

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Step-by-step reasoning:

1. Identify locations: Karaikal, Yanam and Mahe are three separate enclaves of the Union Territory of Puducherry located on the east and west coasts of India.
2. Coordinates and coastlines:
   - Karaikal: approximately $10.95^\circ\mathrm{N},\;79.83^\circ\mathrm{E}$ on the east coast of Tamil Nadu facing the Palk Strait (the water body between India and Sri Lanka).
   - Yanam: about $16.73^\circ\mathrm{N}$ on the east coast of Andhra Pradesh, much farther north from Sri Lanka.
   - Mahe: about $11.67^\circ\mathrm{N},\;75.52^\circ\mathrm{E}$ on the west coast (Kerala) facing the Arabian Sea, not near Sri Lanka.
3. Proximity conclusion: Only Karaikal lies on the Tamil Nadu coast adjacent to the Palk Strait and is in geographical proximity to Sri Lanka. Yanam and Mahe are far from Sri Lanka.

FINAL_ANSWER: a

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