A partial planning budget and actual results from Market Works Corp. are given below: Planning Actual u = 1,200 units u = 1.250 units h = 800 hours h = 820 hours Sales ($50u) Wages ($12h) Supplies ($0.30u) Maintenance ($400 + $2h) $60,000 $9,600 $360 Sales Wages Supplies $64,000 $10,200 $350 $2,000 Maintenance $2,400 What is the activity variance for Sales? A. $2,500 favorable B. $1,500 favorable C. $4.000 favorable D. $1.500 unfavorable