Which grade of tire is providing better quality? Explain. Choose the correct answer below. A. Grade Y provides the better quality. While the mean of Grade X is closer to the expected mean, the standard deviation of Grade Y is much smaller. B. Grade X provides the better quality. While the mean of Grade Y is closer to the expected mean, the standard deviation of Grade X is much smaller. C. Grade Y provides better quality because its mean is much smaller. D. Grade X provides better quality because its mean is much smaller.