Twins have the same age at the current time. In reasoning puzzles, when two members share a relation where their present ages cannot be distinguished (both appear in positions with identical age gaps to others), they are potential twins.
From the given statements, E and C appear in multiple age equality situations:
- B will be as old as E was when E was as old as C is now. This unusual symmetry often hints at equal current ages.
- Both E and C are on the same side of the elder chain above B, with no other constraints between them.
Thus, $E$ and $C$ are the most probable twins.
\(\boxed{\text{Correct Answer: (B) E and C}}\)