Amoving object that makes a sound will sound differently if the object is moving toward or away from you due to the?

The sound of a moving object depends of The effect Doppler, it says that the sound depends of its velocity, fecuency, speed of the souns waves and if the object get move toward or away from you.

I hope you have understood ;)

I leave you a footage so you can understand better :).

Regards.-GokuMil-

The reflection of the candle in the concave mirror formed an upside-down virtual image that is smaller than the candle.in other words. the answer is the third option, c