Select the option that is related to the fifth number-letter cluster in the same way as the fourth number-letter cluster is related to the third number-letter cluster, and the second number-letter cluster is related to the first number-letter cluster.

ELECTRON : TRONCELE :: FUNCTION : TIONCNUF :: CLUSTERS : ?

A

TERSUSLC

B

TRESSULC

C

TERSSUCL

D

TERSSULC