Final answer:
The service fee for home theater systems with accessories can vary and is not a fixed amount; it depends on the retailer, brand, and the service plan selected.
Step-by-step explanation:
The service fee for home theater systems in a box, including accessories like subwoofers, amplifiers, tuners, speakers, and sound bars, is not a fixed cost and can vary by retailer, brand, and the specific service plan you choose. Unfortunately, without additional context it is impossible to determine the correct service fee for these items from the options provided (a) $39.99, (b) $49.99, (c) $59.99, or (d) $69.99. To find the exact fee, you would typically need to consult the service provider or the retailer from where the home theater is purchased.