From the figure, it appears that codes are assigned based on the lengths or weights of the segments or a possible pattern.
We're given:
\[
{EF} = 30, \quad {HJ} = 80, \quad {Other segments: FG, etc.}
\]
Checking the relative arrangement of known values and trying to match with appropriate letter pairings and the provided code, we test each option:
- Option (C): EG is adjacent and seems plausible in sequence. When checked against the pattern and placement of values (e.g., 35, 30, 80), the number 42 for EG fits as a median-like progression.
Hence, Option (C) offers the most consistent logic in terms of both sequence and corresponding values.