The correct option is
D The distribution is symmetrical
Obsrving the given line plot, the left and right sides have equal number of values and the sides are mirror images of one another.
Hence, the distribution is symmetrical.
Hence, the option "The distribution is symmetrical" is true.
Since, the shape of distribution is symmetrical, mean is the best center of measure.
Hence, the option "Median is the best center" is not true.
Since, the distribution is not skewed, MAD is the best variability, hence, "IQR is the best variability" is false.
Since, the distribution is symmetrical "The distribution is skewed" is not true.