Final answer:
Simulated test markets are most likely to alert competitors to a firm's plans.
Step-by-step explanation:
The most accurate statement about test marketing is option c: Simulated test markets are most likely to alert competitors to a firm's plans. Test marketing involves introducing a new product or service to a selected group of consumers in a specific geographical area. Simulated test markets are virtual marketplaces created to replicate real-world market conditions and consumer behavior. However, since these simulations can be accessed by competitors, they may become aware of a firm's plans and potentially respond to them.