Which technique will result in the greatest radiographic density?

a) 300mA, 0.3 sec, 94 kVp, 5:1 grid ratio
b) 300 mA, 0.1 sec, 80 kVp, 12:1 grid ratio
c) 300 mA, 0.2 sec, 80 kVp, 8:1 grid ratio
d) 30 mA, 0.3 sec, 94 kVp, 5:1 grid ratio