The reaction of an alkylnitrile with di isobutyl aluminium hydride followed by acidification produces a molecule of

The reaction of an alkylnitrile with di isobutyl aluminium hydride followed by acidification produces a molecule of aldehyde

Diisobutylaluminium hybridized in Alkyl Nitrate Aluminum is in a stable state due to its link with hydrogen, although a little quantity of the chemical can be reduced through acidification, forming an aldehyde.

Hence, option B is correct.