Explanation:

- First, observe the pattern in the series. Looking at their positions in the alphabet:

- CED: C(3), E(5), D(4)

- FJH: F(6), J(10), H(8)

- KQN: K(11), Q(17), N(14)

- Notice the pattern:

- First letter increases by 3, then 5, then 7.

- Second letter increases by 5, then 7, then 9.

- Third letter increases by 4, then 6, then 8.

- Applying rules to find the missing cluster:

- First letter: K(11) + 7 = R(18)

- Second letter: Q(17) + 9 = Z(26)

- Third letter: N(14) + 8 = V(22)

- Constructed cluster: RZV

- RZV is the correct answer (Option 3)