The Armstrong Corporation developed a flexible budget for its production process. Armstrong budgeted to use 12,000 pounds of direct material with a standard cost of $14 per pound to produce 14,000 units of finished product. Armstrong actually purchased 24,000 pounds and used 15,000 pounds of direct material with a cost of $30 per pound to produce 14,000 units of finished product. Given these​ results, what is​ Armstrong's direct material price​variance?

a. $234,000 unfavorable
b. $156,000 unfavorable
c. $234,000 favorable
d. $156,000 favorable