Fegox Firinghi (FF)produces Flip Flops

Fegox Firinghi (FF) produces flip flops.Each flip-flop requires 2 pounds of Flub and 1 pound of Fleeb,which are planned to cost $8 and $3 per pound,respectively.During the month of May,FF purchased 22,000 pounds of Flub for $179,900 and 13,000 pounds of Fleeb for $42,000.All materials were consumed in producing 10,500 good flip flops. Which is true?

A) Direct materials price variances total $21,000 unfavorable
B) Direct materials price variances total $6,950 unfavorable
C) The standard price of Flub should be revised
D) The standard price of Flub should not be revised
E) a) and c) only