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One Of The Most Important Things Is To First Remember The Formula. The Formula For Means-To-Mad T=Ratio Is:
lMean1-Mean2l

 Larger MAD
So, Lets Plug In The Known Values. 
l 15.3-18.9 l

       1.1
15.3 - 18.9 = -3.6.
Turn To Absolute Value.
3.6
= 3.2727. Now, Remember The Rule. 
1.1
 If this ratio is 1or less, the two distributions are similar. If this ratio is between 1 and 2.5, the two distributions are somewhat similar. If this ratio is greater than 2.5, the two distributions are different. 
So, This Rule Does Not Match Any Of The Conclusions. So, It Is D.