C. The sound waves will return to the person
Step-by-step explanation
When sound waves in air (pressure waves) encounter a hard surface, there is no phase change upon reflection. That is, when the high pressure part of a sound wave hits the wall, it will be reflected as a high pressure, not a reversed phase which would be a low pressure,so in this case, the waves will return to the person
so the answer is
C. The sound waves will return to the person
i hope this helps you