organic flour from a local farmer

115) A baker uses organic flour from a local farmer in all of his baked goods.  For each batch of bread (x1), he uses 4 pounds of flour.  For a batch of cookies (x2), he uses 3 pounds, and for a batch of muffins (x3) he uses 2 pounds.  The local farmer can supply him with no more than 24 pounds per week.  The constraint that represents this condition is:

A) x1 ≤ 8, x2 ≤ 8, x3 ≤ 8

B) x1 + x2 + x3 ≥ 24

C) x1 + x2 + x3 ≤ 24

D) 4x1 + 3x2 + 2x3 ≤ 24