Answer:
A
Step-by-step explanation:
The stethoscope head is made up of two different parts which are the diaphragm and the bell. The bell is specifically for detecting low frequency sound waves while the diaphragm is for high frequency sound. stethoscope come in various kinds some only have a diaphragm while others possess a head that can function as a diaphragm and as a bell depending on the applied pressure to it. others comes with both the diaphragm and bell.