Final answer:
The OC1 odor counteractant and fabric freshener should not be used on carpets, upholstery, and hardwood floors, but can be used on vinyl surfaces.
Step-by-step explanation:
The given question is asking about the surfaces on which the OC1 odor counteractant and fabric freshener should not be used. The correct answer is a) Carpets, b) Upholstery, and d) Hardwood floors. These surfaces are generally porous and can absorb the chemicals, causing damage or discoloration. On the other hand, vinyl surfaces, represented by option c, are non-porous and can tolerate the use of the odor counteractant and fabric freshener.