Select the option that is related to the third letter-cluster in the same way as the second letter-cluster is related to the first letter-cluster.
$$\text{IMR : VRM :: FJO : ?}$$

Let's determine the logic connecting the first cluster $\text{IMR}$ to the second cluster $\text{VRM}$:Each letter of the first cluster is paired with its opposite (reverse positional) letter in the alphabet, but the order of the letters is reversed:The opposite of $\text{I}$ is $\text{R}$ ($9+18=27$)The opposite of $\text{M}$ is $\text{N}$ ($13+14=27$) — wait, let's look at the letters directly.Let's check the positional relation:$\text{I (9), M (13), R (18)}$$\text{V (22), R (18), M (13)}$ Notice that the last two letters of $\text{VRM}$ are $\text{R}$ and $\text{M}$, which are the third and second letters of $\text{IMR}$ in reverse order.Let's look at the first letter: $\text{I}$ becomes $\text{V}$. The reverse of $\text{E}$ is $\text{V}$, and the reverse of $\text{I}$ is $\text{R}$.Let's find another relation:$I(9)+13=22(V)$$M(13)+5=18(R)$$R(18)-5=13(M)$ Let's test this pattern on $\text{FJO}$:$\text{F (6), J (10), O (15)}$$6+13=19\to \text{S}$$10+5=15\to \text{O}$$15-5=10\to \text{J}$ This gives the cluster SOJ.