The following is monthly budgeted cost and activity information for two activities in the purchasing department of X Company:

Activity	Variable Costs	Fixed Costs	Cost Driver
Supplier relations	$5,460	$15,400	210 suppliers
Invoicing	$8,520	$20,900	710 invoices

In November, actual costs and activity were as follows:

Activity	Total Costs	Driver Amount
Supplier relations	$20,131	188 suppliers
Invoicing	$28,377	650 invoices

What was the flexible budget variance for the supplier relations activity for November (assume that favorable variances are positive numbers and unfavorable variances are negative numbers)?

A: $-15,243

B: $-14,671

C: $-4,731

D: $0

E: $157

F: $729