Four groups of numbers have been given, out of which three are alike in some manner and one is different. Select the group that is different.

From the given option (A),(B),(D) is follow the same pattern is given below

(A) 17:102:204 is follow pattern $$17: 17\times 6 $$

$$\Rightarrow $$17:102: 102\times 2 $$

$$\Rightarrow $$17:102:204$$

same option (B) 12:72 :144

$$ 12 : 12\times 6 $$

$$\Rightarrow 12: 72: 72\times 2 $$

$$ \Rightarrow 12:72:144 $$ 

same as option (D) 26:156:312

$$26:26\times 6 $$

$$ 26: 156 :156\times 2 $$

$$26:156: 312 $$

But option (C)14:90:180 is not follow the pattern 

$$14: 14\times 6 $$

$$\Rightarrow 14:84 $$

$$\Rightarrow 14: 84:84\times 2 $$

$$\Rightarrow 14 : 84 : 168$$

therefore option (C ) is odd from the given option 

then (C) 14:90:180 Ans