How are the Bell Telephone Company and
AT&T related?

A. Bell established the Bell Telephone Company and
then sold it to AT&T.

B. Bell established the Bell Telephone Company,
and when he left, it became AT&T.

C. Bell established the Bell Telephone Company first and then created AT&T to build and manage the lines needed for telephones.

D. Bell established the Bell Telephone Company first and then created AT&T when his business expanded to include telephones and telegraphs.