Common Size Question

Had this practice question and I am not sure how this answer makes sense to me. My choice was B:

Which of the following is an analyst least likely to be able to find on or calculate from either a common-size income statement or a common-size balance sheet?

A) Inventory turnover.

B) Operating profit margin.

C) Debt to equity ratio.

The correct answer according to the key was A.

Any help is appreciated.

well, I guess you may have to just memorise it…

Common-size Income Statement is expressing each line item as a percentage of revenue or total cash flows.

Common-size BS is expressing as a percentage of total asset.

B and C are giving some percentages of above two while A is not…

I hope that helped!

Wow, reading it like the actual math you just typed out and saying “% of TA”. I simply just didn’t put the two together when I read it. I should probably slow down.