25) C
A – Wrong
C is not directly connected to X. It first has to go to I and then to X. So, there cannot be a direct line from C to X.
B – Wrong
A is not directly connected to I. It first has to go to C and then to I. So, there cannot be a direct line from A to I.
C – Correct
E is directly connected to G. So, there must be a direct line from E to G.
D – Wrong
F is not directly connected to G. It first has to go to E and then to G. So, there cannot be a direct line from E to G.
E – Wrong
J is not directly connected to X. It first has to go to I and then to X. So, there cannot be a direct line from J to X.