Alexander Graham Bell and Alexander Graham Bell’s assistant, Thomas Watson, worked together on making the world’s first telephone.

Which is the best revision using pronouns?

A.Best as is.
B.Alexander Graham Bell and his assistant, Thomas Watson, worked together on making the world’s first telephone.
C.He and his assistant, they worked together on making the world’s first telephone.
D.Alexander Graham Bell and Alexander Graham Bell’s assistant, Thomas Watson, they worked together on making the world’s first telephone.