For the following experiment, indicate whether it was single-blind, double-blind, or not blinded at all. Explain your reasoning. Makers of a new frozen entree arranged for it to be served to randomly selected customers at a restaurant in place of the equivalent entree ordinarily prepared in the kitchen. After their meal, the customers were asked about the quality of the food. Choose the correct answer below. A. The experiment was double-blind because neither the customers nor the kitchen staff knew which treatment the customers received. B. The experiment was single-blind because the customers receiving the frozen entree did not know which treatment they were receiving, but the customers receiving the ordinary entree knew. C. The experiment was double-blind because neither group of customers knew which treatment they were receiving. D. The experiment was not blinded at all because both the customers and the kitchen staff knew which treatment the customers received. E. The experiment was single-blind because the customers did not know which treatments they were receiving, but the kitchen staff knew.