Which of the four options will replace the question mark (?) in the following…

To solve the series XF 11, YI 15, ZL 19, AO 23, ?, we must break the terms down into three separate components: the first letter, the second letter, and the number.

Analysis of the Pattern
First Letter Progression:

X to Y (+1)

Y to Z (+1)

Z to A (+1)

Following this, A to B (+1).

Second Letter Progression:

F to I (+3)

I to L (+3)

L to O (+3)

Following this, O to R (+3) (O, P, Q, R).

Number Sequence:

11 to 15 (+4)

15 to 19 (+4)

19 to 23 (+4)

Following this, 23 to 27 (+4).

Solution
The next term in the series is BR 27.