Answer:
Option (c) 
Step-by-step explanation:
As per the data given in the question, 
 Standard quantity of material = 15,000 pounds for 10,000 units 
Unfavorable variance in the quantity of material occurs when more material is used in comparison to the standard quantity.
As, Actual quantity = 17,000 pounds used for production of 10,000 units 
It caused unfavorable material quantity variance. 
Hence, the data which warned company about the problem is : 
Actual quantity of 17,000 pounds used for the production of 10,000 units. 
Option (c) is correct answer.