Daily demand for newspapers for last 10 days has been as follows: 12, 13, 16, 15, 12, 18, 14, 12, 13, 15 (listed from oldest to most recent). Forecast sales for next day using two-day weighted moving average where weights are 3 and 1 are
A. 14.5
B. 13.5
C. 14
D. 12.25