I'm going to say B because the other answers just don't seem to make sense.
Answer:
Cleaning.
Explanation:
Ultrasound are the high sound waves that has the frequency above than 20kHz. The ultrsonic sound can be detected by animals like bats and has medical importance as well.
The cleaning of the medical instruments and machines are done by ultrasonic cleaners. These cleaners uses the ultrasonic waves to clean the dirt and needs a proper solvent medium for cleaning. The cavitation bubbles are produced that are used for cleaning.
Thus, the correct answer is cleaning.
The correct letter answer is A or C. Choose whichever one you want. I think it's C, but you can consider A also. :)
Answer:
b long term goal
Explanation:because it takes a long time
