Encyclopedia Britannica is an encyclopedia publisher who sells printed encyclopedias. In the 1990s, encyclopedias began to be sold electronically. What effect did electronic encyclopedias have on Encyclopedia Britannica? Electronic encyclopedias
A. served as a complement, increasing sales of electronic and printed encyclopedias.
B. resulted in the government requiring patents for educational materials.
C. served as a superior product to heavy, bulky, and expensive printed encyclopedias.
D. used printed encyclopedias from Encyclopedia Britannica as a key input.
E. prompted Encyclopedia Britannica to form the first cartel for encyclopedias.