The two plot dots below show the heights of some sixth graders and some seventh graders:

The mean absolute deviation (MAD) for the first set of data 1.2 and the MAD for the second set of data is 1.7. Approximately how many times the variability in the heights of the sixth graders is the variability in the heights of seventh graders? (Round all values to the tenths place)
A.) 1.2
B.) 1.4
C.) 2.4
D.) 2.8