Explanation:

- Let's break down the letter clusters:

- BJT: The alphabetical positions are B=2, J=10, T=20.

- GCV: The alphabetical positions are G=7, C=3, V=22.

- DDP: The alphabetical positions are D=4, D=4, P=16.

- FBL: The alphabetical positions are F=6, B=2, L=12.

- Looking for patterns:

- BJT: Difference between positions is 8 (J-B) and 10 (T-J).

- GCV: Difference between positions is -4 (C-G) and 19 (V-C).

- DDP: Difference between positions is 0 (D-D) and 12 (P-D).

- FBL: Difference between positions is -4 (B-F) and 10 (L-B).

- Pattern Analysis:

- BJT and FBL maintain increasing order between all letters.

- GCV has an anomaly as the first two letters decrease.

- DDP has consistent values for the first two letters.

- The cluster with an odd sequence is more unique in the order.

Correct Answer: Option 2, GCV