The answer is B that is Constructive interference will occur, causing the new wave to have more energy than Wave A or Wave B.
This is because whenever waves meet in phase that is trough on trough or crest on crest a constructive interference occurs.
Constructive interference means that the waves will now possess more energy, typically summing up booth of the troughs or crests energy.
A destructive interference only occurs when waves are out of phase.