Which statement describes an example of constructive and interference

It should be d if not then c

It maybe because uranus is made of gas but uranus has a solid core in the middle

The correct option is this: the sound waves from the two trombones have slightly different frequencies.from the question given above, we are told that the loudness of the sounds were increasing and decreasing, this is because the frequencies of the two sounds are different. the means that the number of waves that pass a fixed point in a given amount of time differ for both sounds.