Wave Pulse Superposition and Motion Steps:

• Each pulse moves 0.15 m in 0.3 s at 0.5 m/s speed (distance = speed × time).
• Left pulse shifts right by 0.15 m; right pulse shifts left by 0.15 m.
• Pulses partially overlap, adding displacements per superposition principle.
• Resulting shape combines shifted pulses with constructive interference in overlap.

Why C is correct:

• Matches superposition principle: identical pulses overlap symmetrically, producing a diagram with partial constructive interference and unchanged total wavelength.

Why the others are wrong:

• A: Shows no overlap, ignoring 0.15 m approach per pulse.
• B: Depicts full destructive interference, incorrect for same-amplitude same-direction pulses.
• D: Illustrates reversed directions, violating initial towards-each-other motion.

Final answer: C