Which of the following term will replace the question mark (?) in the given series?

Series:

IMHP, MPJQ, QSLR, UVNS, ?

Observe each position separately:

1st letters:

I → M → Q → U

Each increases by $+4$

U → Y

2nd letters:

M → P → S → V

Each increases by $+3$

V → Y

3rd letters:

H → J → L → N

Each increases by $+2$

N → P

4th letters:

P → Q → R → S

Each increases by $+1$

S → T

So next term = YYPT

Correct Answer: YYPT