After fixing __ CO₂'s using the enzyme ___, the Calvin cycle forms ___ G3Ps with a total of __ carbons. At this point, the net gain of carbons is ___, or one net G3P molecule.
a) 3, Rubisco, 6, 12, 3
b) 4, Rubisco, 6, 18, 4
c) 5, ATP synthase, 3, 15, 5
d) 6, ATP synthase, 4, 24, 6