Schedule of Activity Costs
Quality Control Activities	Activity Cost
Process audits	$50,000
Training of machine operators	28,000
Processing returned products	19,000
Scrap processing (disposal)	25,000
Rework	8,000
Preventative maintenance	30,000
Product design	46,000
Warranty work	12,000
Finished goods inspection	23,000

From the above schedule of activity costs, determine the external failure costs.

a.$39,000

b.$19,000

c.$31,000

d.$12,000