Write the following as a linear inequality. Coffee costing $6 per lb is to be mixed with coffee costing $3 per lb to get at least 39 lb of a blended coffee. Let x and y represent the number of pounds of the first and second coffees, respectively. Choose the correct answer below. A. x+y≥39 B. 6x + 3y ≤ 39 C. 6x + 3y ≥ 39 OD. x+ys39