My sister is the only member in my family. She holds a Ph.D. degree in Physics

A. My sister is the only member in my family to hold a Ph.D. degree in Physics.

B. The only member in my family is my sister, who holds a Ph.D. degree in Physics.

C. The only member in my family which holds a Ph.D. degree is my sister.

D. My sister, who holds a Ph.D. degree in Physics, is the only member in my family.