Which reagent would not be a good choice for reducing aryl nitro compound to amine?

 ${\mathrm{LiAlH}}_4$ in ether is the reagent that would not be a good choice for reducing aryl nitro compound to an amine. Aryl nitro compound can't be converted into an amine by using ${\mathrm{LiAlH}}_4$ in ether. Following is the reaction that takes place when aryl nitro compound is reacted with the given reagents.

Hence, the correct answer is option B) ${\mathrm{LiAlH}}_4$ in ether.