Select the option that is related to the fifth letter-cluster in the same way as the second letter-cluster is related to the first letter-cluster and the fourth letter-cluster is related to the third letter-cluster.
SPRUCES:RPSSECU::ALRIGHT:RLATHGI::RESPECT:?

Let's study how the letters are rearranged in the first pair: SPRUCES → RPSSECU
1st and 2nd letters (S, P) are reversed → P, S? Wait, it says R, P, S. Let's map positions by index (1 to 7):
S(1) P(2) R(3) U(4) C(5) E(6) S(7)
R(3) P(2) S(1) S(7) E(6) C(5) U(4)
So the pattern reverses the first 3 letters: 1,2,3→3,2,1 (SPR → RPS), and reverses the last 4 letters: 4,5,6,7→7,6,5,4 (UCES → SECU).
Combined: RPSSECU.

Let's verify this pattern with the second pair: ALRIGHT → RLATHGI

First 3 letters (ALR) reversed → RLA

Last 4 letters (IGHT) reversed → THGI

Combined: RLATHGI.

Now let's apply this exact split-reversal to RESPECT:

First 3 letters (RES) reversed → SER

Last 4 letters (PECT) reversed → TCEP

Combined: SERTCEP

Therefore, Option A is the correct answer.