$$9\times72=648$$  $$78\times8=624$$  $$648-624=24$$ 
A dataset of $9$ numbers has an average of $72$. After removing one of the numbers, the average of the remaining numbers becomes $78$. The number that gets removed is~\uline{~~~~~~~~~~}~. 
Options:
[A] $$6$$ 
[B] $$24$$ 
[C] $$48$$ 
[D] $$60$$ 