The following is monthly budgeted cost and activity information for two activities in the purchasing department of X Company: Activity Supplier relations Invoicing Variable Fixed Cost Costs Costs Driver 270 $6,480 $16,800 suppliers $13,350 $23,100 890 Invoices In November, actual costs and activity were as follows: sc ab Total Driver Activity Costs Amount Supplier relations $22,399 268 suppliers Involcing $35,254 873 invoices What was the flexible budget variance for the involcing activity for November (assume that favorable variances are positive numbers and unfavorable variances are negative numbers)? A: 5-22,159 B: $ 21,904 C: $-12,154 E: $941 F: $1,196 D: $0