What conclusion can be derived by comparing the central tendencies of the two data sets?

a: {7, 6, 3, 1, 6, 2, 4, 6, 3, 5}

b: {2, 2, 2, 3, 4, 5, 2, 8, 7, 6}

a.
the mean of set a is smaller than the mean of set b.

b.
the median of set a is greater than the median of set b.

c.
the median and the mean of set b are greater than those of set a.

d.
the mode of set b is greater than the mode of set a.