Which sentence is punctuated correctly?
A.
I want to thank my piano teacher, Martha Rufenacht for her commitment and kindness.
B.
I want to thank my piano teacher, Martha Rufenacht, for her commitment and kindness.
C.
I want to thank my piano teacher Martha Rufenacht, for her commitment and kindness.
D.
I want to thank my piano teacher Martha Rufenacht for her commitment and kindness.