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Let's calculate No of Units as Revenue / Unit price.
Per Unit cost as (Revenue - Profit ) / No of Units.
In that way, we calculate the table as follows.

Let's solve the options one by one,
Option A : Volatility for price per unit : 14-8/11.45 = 0.524
Option B :Volatility for Cost per unit : 13-5/8.91 = 0.898
Option C:Volatility for Total profit : 400-0/154.54 = 2.588
Option D:Volatility for Revenue = 1400-200/809.1 = 1.48
Among the above values ,volatility for total profit is the highest .
Hence C is the correct answer.