Please help solving the question4 c. If it is possible,please give me a detailed explanation. Thank you so much

Question 4 A pharmacist has been monitoring sales of a certain over-the-counter pain reliever. Monthly sales during the last 15 months were: Month Number sold Month Number sold Month Number sold 1 49 50 49 52 48 a. Using 3-Month Weighted Moving Average using 0.2, 0.3, and 0.5 with the heaviest weights applied to the most recent months, develop forecasts for months from 11 to 16. b. Using Exponential Smoothing using an a=0.4 and the 10th Month forecast of 50, develop forecasts for months from 11 to 16. c. Using Trend Projection, develop forecasts for months from 11 to 16. d. Justify which method you would suggest using to predict future sales