QUANTITY OF WHEAT $($Number of bushels$)$ QUANTITY OF CLOTHING $($Number of garments$)$

$A=3300$ wheat, $1500$ garments

$B=3000$ wheat, $2500$ garments

$C=2500$ wheat, $3500$ garments

$D=0$ wheat, $5000$ garments

Refer to FIGURE $1.$ The opportunity cost of moving from $B$ to $C$ is