Photographic negative film has to be developed by using chemicals in precise, fixed proportions.This means that film and developing chemicals are:
A)perfect complements
B)Giffen goods
C)perfect substitutes
D)obsolete because everyone uses digital cameras

Question

Quizplus · Accepted Answer

Film and developing chemicals are perfect complements because they must be used together in fixed proportions to create a successful photographic negative.

Photographic Negative Film Has to Be Developed by Using Chemicals