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Answer

Correct Option is fortify

Solution: Among the given words, ‘fortify’ is synonymous with ‘underpin’. Hence, option (b) is the most suitable answer choice.
Fortify: strengthen (someone) mentally or physically
Underpin: support, justify, or form the basis for.
Envious: feeling or showing envy.
Extant: still in existence; surviving.
Obsolete: no longer produced or used; out of date.
Hybridise: cross-breed (individuals of two different species or varieties).

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