Kodak Was Once the Largest Supplier of Photographic Film

Kodak was once the largest supplier of photographic film. In 2004 it was dropped from the Dow Jones Industrial Average after having been listed for 74 years. Kodak failed to use IT to fend off which one of the following of Porter's 5 competitive forces?

A) Bargaining power of suppliers
B) Threat of substitute products
C) Potential threat of new entrants
D) Bargaining power of buyers
E) Industry collaboration