Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
TJF, RMH, PPJ, NSL, ?

Let's analyze the pattern for each letter in the clusters step-by-step:
First letter of each cluster:

T(20)−2→R(18)

R(18)−2→P(16)

P(16)−2→N(14)

N(14)−2→L(12)

Second letter of each cluster:

J(10)+3→M(13)

M(13)+3→P(16)

P(16)+3→S(19)

S(19)+3→V(22)

Third letter of each cluster:

F(6)+2→H(8)

H(8)+2→J(10)

J(10)+2→L(12)

L(12)+2→N(14)

Combining these, the missing cluster is LVN.