For the following incomplete combustion reaction, what are the coefficients necessary to balance the equation:

___ CH4 + ___ O2 → ___ CO2 + ___ H2O + ___ C + ___ CO

Select one:
a. 4,6,1,8,1,2
b. 4,8,1,2,1,6
c. 8,1,1,2,4,6
d. 6,1,8,2,1,4