Which of the following groups of exposure factors will produce the shortest scale of contrast?
A. 200 mA, 0.08 second, 95 kV, 12:1 grid
B. 500 mA, 0.03 second, 70 kV, 8:1 grid
C. 300 mA, 0.05 second, 95 kV, 8:1 grid
D. 600 mA, 1/40 seconds, 70 kV, 6:1 grid