Economics question

The price of gasoline was much higher in 2005 than it was in 2004 and yet roughly the same amount of gasoline was bought in both years.  What can explain this? 

 

______ A)
The supply of gasoline stayed constant. B)
The demand for gasoline increased from 2004 to 2005. C)
The demand for gasoline does not follow the law of demand. D)
None of these explain this. 

 

Can you please justify your answer please!

I need it asap