What defines an echo chamber?

Following is the graph of a polynomial . Which of the following statements is correct about ?      

Name the vessel labeled “A”

Which tunic is labeled “D”?

What is the specific name of the muscle labeled “C”?  It is attached to the “strings”.

Name the specific structure labeled “B”

Name the vessel labeled “B”.

Name the vessel labeled “H”.

What type of blood vessel is labeled “B”?

Name this enlarged lymphatic vessel labeled “5”