Question

he is liable_ his wife's debt.​

Answer 1

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$\mathfrak{The\:Answer\:is}$

He is liable for his wife's debt.

$\boxed{Hope\:This\:Helps}$

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Answer 2

He is liable for his wife's debt.​

• We were supposed to fill in the given blank with the help of the correct preposition.
• Let us first understand the meaning of prepositions.
• A preposition is a word that can be used to define the relationship that pertains between the noun or pronoun and the rest of the sentence.
• Here the preposition "for" should be used because it is used when we refer to the reason behind something.