The Test

In the morning, they thought of a plan.  They made themselves look as dirty as possible, with grease and dirt.They then went to the teacher and said that they had gone to a wedding last night and on their return, a tire burst on their car and they had to push the car all the way back home and that they were in no condition to do the test.The teacher kindly allowed them to do a re-test after 3 days.They thanked him and said they would be ready by that time.
On the third day, they went for their test.The teacher said that as this was a Special Condition Test, all four were required to sit in separate classrooms.They all agreed as they had prepared well in the last 3 days...
 
The test consisted of 1 single question, worth a total of 100 Points....... 
 
 
 
 
 
 
 
Q. 1. Which tire?
    a) Front Left           b) Front Right    c) Back Left            d) Back Right