Why didn't Mexico join OPEC?

a.Mexico was never asked to join

b.Mexico wanted to join, but it was not an Arab country and its membership request was denied

c.Mexico did not want to offend the U.S.

d.Mexico decided not to join because it could get all of the benefits of the cartel without having to put up with the cost and obligations of cartel membership

e.Mexico did not produce enough oil to make membership worthwhile