A cement manufacturer has supplied the following data:

Tons of cement produced and sold	220,000
Sales revenue	$924,000
Variable manufacturing expense	$297,000
Fixed manufacturing expense	$280,000
Variable selling and administrative expense	$165,000
Fixed selling and administrative expense	$82,000
Net operating income	$100,000

What is the company's unit contribution margin?

A) $4.20 per unit

B) $1.90 per unit

C) $2.10 per unit

D) $0.45 per unit