The four numbers are 143, 168, 195, and 225.

143, 168, and 195 are of the form $$n^2-1$$

143 = $$12^2-1$$

168 = $$13^2-1$$

195 = $$14^2-1$$

225 = $$15^2$$

Hence, the number 225 is the odd one out among the given numbers.

Alternate:

The difference, (168-143) = 25, (195-168) = 27, hence the next difference should be 29. Hence, the next number should be (195 + 29) = 224.

Therefore, 225 is the odd number here. The correct option is C.