The standard costs and actual costs for direct materials for the manufacture of 2,550 actual units of product are as follows: Standard Costs Direct materials 2,550 Kilograms at $8.90 Actual Costs Direct materials 2,600 kilograms at $3.05 The direct materials quantity variance is Oa, 5356 favorable Ob. 5356 unfavorable Oc. $445 favorable Od 5645 unfavorable