Which sentence contains an inappropriate shift in tense?

A.
Often the baby stands in the crib and holds onto the rail.

B.
As soon as the alarm clock rings, Neal is eager to get out of bed.

C.
Antoine brushed his teeth before he eats his breakfast.

Question

Which sentence contains an inappropriate shift in tense?  
 
 

 
 

  

  A. 
  Often the baby stands in the crib and holds onto the rail.   
   

 
 

  

  B. 
  As soon as the alarm clock rings, Neal is eager to get out of bed.   
   

 
 

  

  C. 
  Antoine brushed his teeth before he eats his breakfast.

anonymous · Answer

I am pretty sure that the answer is C.
It should be: Antoine brushes his teeth before he eats his breakfast.

anonymous · Answer

Or   Antoine brushed his teeth before he ate his breakfast.