Scale of contrast formula?

I came across this question on a registry review and am struggling to answer it mathematically.

Which of the following will produce the shortest scale of contrast?

A. 15 mAs, 70 kVp, 8:1 grid

B. 15 mAs, 95 kVp, 8:1 grid

C. 15 mAs, 70 kVp, 6:1 grid

D. 16 mAs, 95 kVp, 12:1 grid

I think C is wrong bc the low grid ratio. B is incorrect bc the higher kVp (compared w/ A, the higher kVp in B would lead to longer scale contrast. W all other factors being equal between the 2 choices, the kVp is the determining factor.) So I think I’ve narrowed it down to choices A and D, but what will contribute more to a shorter scale contrast: the lower kVp of choice A or the high grid ratio of choice D?

Is there a mathematical way/formula to solve this?

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source https://www.reddit.com/r/Radiology/comments/jz8g61/scale_of_contrast_formula/

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