Horizontal integration is best illustrated by
(A) Andrew Carnegie controlling all aspects of the production process
(B) John D. Rockefeller eliminating all competing fi rms that produced
the same products
(C) Cornelius Vanderbilt issuing noncompetitive railroad rebates
(D) John P. Morgan artifi cially infl ating the price of his own stocks
(E) Henry Frick using private detective agencies to break strikes