Correct option is C
The correct one-word substitution is
(c) Isthmus.
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Definition: A narrow strip of land with sea on either side, connecting two larger land areas.
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Isthmus (Hindi meaning): भू-संधि.
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Example: The Isthmus of Panama connects North and South America.
Meanings of other options:
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Peninsula: A piece of land almost surrounded by water but connected to the mainland (प्रायद्वीप).
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Island: A piece of land surrounded by water (द्वीप).
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Strait: A narrow passage of water connecting two large bodies of water (जलडमरूमध्य).