Out of the number of vehicles manufactured by company P in 2012, 15000 pieces were found defective and out of the number of vehicles manufactured by company Q in 2013, 10000 pieces were found defective. What is the respective ratio of non-defective vehicles manufactured by company P in 2012 and Q in the 2013?
A) 9 : 8
B) 11 : 4
C) 3 : 8
D) 5 : 8
E) 7: 4
Correct Answer: A