The correct answer is A. 0.
Normalized data are centered at 0 and have units equal to standard deviations of the original data. This means that the mean of the normalized data is 0 and the standard deviation of the normalized data is 1.
Option B is incorrect because 5 is not the mean of the normalized data.
Option C is incorrect because 1 is not the standard deviation of the normalized data.
Option D is incorrect because 10 is not the mean or the standard deviation of the normalized data.