A coffee-dispensing machine is supposed to deliver 8 ounces of liquid into each paper cup, but a consumer believes that the actual mean amount is less. The consumer obtained a sample of 16 cups of the dispensed liquid with sample mean of 7.75 ounces and sample variance of 0.81 ounces. If the dispensed liquid delivered per cup is normally distributed, the appropriate decision at =0.05 is A. increase the sample size B. reject the 8-ounces claim C. fail to reject the 8-ounces claim D. maintain status quo E. reduce the sample size