Select the correct option from the following and also explain it.

Gould Enterprises sells computer disks for $1.50 per disk. Unit variable expenses total $0.90. The breakeven point in units is 3,000 and expected sales in units are 4,300. What is the margin of safety in dollars?

A) $4,500

B) $1,950

C) $3,870

D) $6,450