Among the four terms listed, three are alike in some manner and one is different. Select the term that is different from the rest.

Logic: Add 3 to the place value of the given letter to get the number in each term.

(a) A4 $$\rightarrow$$ A + 3 = 1 + 3 = 4​

(c) K14 $$\rightarrow$$ K + 3 = 11 + 3 = 14

(d) P19 $$\rightarrow$$ P + 3 = 16 + 3 = 19

So, only the second option does not follow the same pattern as followed by the other options.

Thus, the correct answer is (b).