A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.
PON, LKJ, GFE, ?

Each group consists of three consecutive letters written in reverse alphabetical order.
Let's trace the transition between the last letter of one group and the first letter of the next:

PON→N(14)
−2

​
L(12)→LKJ

LKJ→J(10)
−3

​
G(7)→GFE

GFE→E(5)
−1

​
D(4)→D, C, B (which is not perfectly matching standard alternative structures directly via simple uniform hops, so let's check the first letters of each block instead):

First letter pattern:
P(16)
−4

​
L(12)
−5

​
G(7)
−3

​
D(4)

Following reverse continuous blocks:
P, O, N (Positions: 16,15,14)
L, K, J (Positions: 12,11,10) - skips M
G, F, E (Positions: 7,6,5) - skips H, I
The next sequence following a reduction trend with consecutive downward sequences should start from B or A. Let's verify option alignment. Looking closely at the gaps:
N to L has a gap of 1 letter (M).
J to G has a gap of 2 letters (I, H).
So, the gap from E to the next group should have a gap of 3 letters (D, C, B).
The next group must begin with A, and follow the reverse consecutive pattern: A, Z, Y.

Thus, AZY completes the pattern perfectly.