At the beginning of the year, X Company expected to produce 3,500 units of its only product. Its estimate of fixed overhead was $13,000, and its estimate of variable overhead per unit was $6.97.

At the end of the year, 2,600 units were actually produced, with actual total overhead cost of $29,651.

What was X Company's total overhead flexible budget variance for the year [a positive number means a favorable variance; a negative number means an unfavorable variance]?

A: $1,019

B: $1,152

C: $1,302

D: $1,471

E: $1,662

F: $1,878