Directions: Answer the questions based on the information given below.

The line graph given below shows the number of tickets sold for 'Domestic' flights and the number of tickets sold for 'International' flights by five different online booking sites. (in millions)

Total number of flight tickets sold by the booking site = Number of tickets sold for 'Domestic' flights by the booking site + Number of ticekts sold for 'International' flights by the booking site.

Note : 

(1) If the total number of tickets sold by a booking site is less than 400 millions then the booking site is given 'C' rating.

(2) If the total number of tickets sold by a booking site is in between 400 millions to 500 millions then the booking site is given 'B' rating.

(3) If the total number of tickets sold by a booking site is more than 500 miliions then the booking site is given 'A' rating.