Answer: The correct option is B.
Step-by-step explanation:
In the given problem, two mechanical waves intersect and produce the straight line seen here. It means that the new wave having zero amplitude is formed.
Destructive interference is the interference of the wave in which the new wave will form with lower amplitude.
Constructive interference is the interference of the wave in which the new wave will form with lower amplitude.
Therefore, the correct answer is B.