Select the letter-cluster that will replace (?):
B, F, J, N, R, V, Z, ?

The correct answer is Option 4 (D).

To find the missing letter in the series, let's analyze the position of each letter in the standard English alphabet:

• B = 2
• F = 6
• J = 10
• N = 14
• R = 18
• V = 22
• Z = 26

Notice the pattern in the alphabetical positions:

$2+4=6$

$6+4=10$

$10+4=14$

$14+4=18$

$18+4=22$

$22+4=26$

Each letter is obtained by adding 4 to the alphabetical position of the previous letter.

Continuing the pattern after Z (26th letter), we loop back to the beginning of the alphabet:

$26+4=30$

$30-26=4$

The 4th letter of the English alphabet is D.