Refer to the table below. In this instance, expansion of output Q P TR MR TC MC 0 $30 $15 1 $30 $30 $30 $25 $10 2 $30 $60 $30 $40 $15 3 $30 $90 $30 $60 $20 4 $30 $120 $30 $85 $25 5 $30 $150 $30 $115 $30 6 $30 $180 $30 $150 $35a) leaves input prices constant as demand for inputs increases. ( b) caus causes diseconomies of scale to occur. O c) occurs C) occurs because of increasing returns to scale. O d) causes input prices to rise as demand for inputs decreases