The correct answer is (b).
The mode is the most frequent value in a data set. The mean is the average of the values in a data set. The median is the middle value in a data set when the values are arranged in order from least to greatest.
In a moderately skewed frequency distribution, the mean, median, and mode are not necessarily equal. However, in this case, the mode and mean are both 16, so the median must also be 16.
Option (a) is incorrect because the median cannot be zero. The median is the middle value in a data set, and a data set cannot have a middle value of zero if there are any positive values in the data set.
Option (c) is incorrect because the median is not necessarily equal to the mode. In a moderately skewed frequency distribution, the mean, median, and mode are not necessarily equal.
Option (d) is incorrect because the median is not necessarily equal to the mean. In a moderately skewed frequency distribution, the mean, median, and mode are not necessarily equal.