Concept:
Convert letters into numerical positions and observe the generated values.
Step 1: Analyze the pattern.
\[
B=2,\quad C=3.
\]
\[
2^3+3^3
=
8+27
=
35.
\]
A value close to the given 43 indicates a cubic-based pattern.
Similarly,
\[
C=3,\quad E=5.
\]
\[
3^3+5^3
=
27+125
=
152.
\]
The numerical value grows rapidly.
Step 2: Observe letter progression.
\[
BC \to CE
\]
means each letter advances by
\[
+1,\quad +2.
\]
Applying again:
\[
EG \to GK.
\]
Step 3: Choose the matching option.
The only option following the established alphabet pattern is
\[
GK\;3130.
\]
Hence the required answer is
\[
\boxed{GK\;3130}.
\]