Correct option is C
The correct one-word substitute is Invincible.
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Invincible means
too powerful to be defeated or overcome. (अजेय)
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Example: The superhero was believed to be
invincible in battle.
Meanings of the given options:
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(a) Invisible: Not visible or unable to be seen. (अदृश्य)
·
(b) Unavoidable: Cannot be avoided or evaded. (अपरिहार्य)
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(d) Ineluctable: Impossible to avoid or escape. (अटल)