Energy: Top Oil Producers

Each of the world's top three oil producers dominate oil production so much that they produce more than TWICE that of the number four country. The #1 and #2 countries are close to tied, each producing over 11 million barrels/day)

According to the EIA, the two "Top World Oil Producers" in 2012 were: 

a) Saudi Arabia and Iran 
b) Saudi Arabia and Russia 
c) China and Iran
d) Saudi Arabia and United States
e) Russia and China  
f) Canada and Iran

Bonus questions:
Which were #3 and #4?
Which were #5 and #6?

Source: http://205.254.135.7/countries/

Prize codes: SB111457, SB222867, SB333876, , SB444896, SB555673, SB999123, SB888324,  SB777456,  SB666234



Answers:
1 & 2: (d)
3 & 4: (e)
5 & 6: (f)
7 & 8: UAE, Iraq
9 & 10: Mexico, Kuwait