Menlove Company had the income statement for the most recent year:Sales (17,000 units) ----- $357,000Variable expenses ------- 255,000Contribution margin ---- 102,000Fixed expenses ---------- 68,000Net operation income --- $34,000Given this data, the unit contribution margin was:a. $2 per unitb. $15 per unitc. $6 per unitd. $4 per unit