A wrestler is trying to gain weight for an upcoming match. His current weight is 105. In the formula shown, W = weight, p = pounds and t = time(weeks). He has 6 weeks before his match and has a goal weight of 123 pounds. Determine the minimum number of pounds he must gain per week to meet his goal. A) 1 pound B) 2 pounds C) 3 pounds D) 4 pounds