Consider the reaction:
RCHO + NH2NH2 RCH = N - NH2
What sort of reaction is it?
Free radical addition - elimination reaction
Electrophilic substitution elimination reaction
Nucleophilic addition - elimination reaction
Electrophilic addition - elimination reaction
Hence overall this reaction is nucleophilic addition elimination reaction.
Option 1)
Free radical addition - elimination reaction
Incorrect
Option 2)
Electrophilic substitution elimination reaction
Incorrect
Option 3)
Nucleophilic addition - elimination reaction
Correct
Option 4)
Electrophilic addition - elimination reaction
Incorrect