Which DAX expression formats the number to display 20.00%?

The DAX expression that correctly formats the number to display 20.00% is recognized as the appropriate choice because it converts the decimal value representing 20% into a percentage format correctly. In DAX, when using the FORMAT function, the input should reflect the decimal equivalent of the percentage.

In this case, 0.2 represents 20% when formatted as a percentage. When applying the FORMAT function with the string "Percent", it translates the decimal (0.2) into the percentage form of 20.00%. The result adheres to the requested two decimal places, achieving the expected output accurately.

Looking at the other values: 20 is interpreted as 20,000% since no decimal is provided to indicate a proportion. The input of 2 signifies 200%, also far beyond the desired format. Although 0.20 is a decimal representation of 20%, when the format "Percent" is applied, it does not ensure two decimal places, which might lead to a result of 20%. Therefore, option B stands out as the only one that meets both the numerical representation and the formatting criteria accurately.