Complete the alternating letter string by filling the blanks in order. Series: gfe _ ig _ eii _ fei _ gf_ ii

Introduction / Context:
This is an alphabetic pattern-completion puzzle. The given letters repeat in intertwined strands. Your job is to insert five letters (from one option) into the five blanks in order so the overall sequence maintains its interleaving logic.

Given Data / Assumptions:

• Base: gfe _ ig _ eii _ fei _ gf_ ii
• Options each contain 5 letters, to be placed left-to-right in the blanks.
• The final string should show smooth local transitions and a consistent weave of mini-patterns like gf→e, fei→, and eii→.

Concept / Approach:
Look for micro-motifs: “gfe”, “fei”, and “eii” recur and are often separated by single-letter links. Choose the option that sustains these micro-motifs without collisions (e.g., impossible bigrams) and preserves symmetry.

Step-by-Step Solution:
Insert the candidate letters of "ifgie": gfeiigfeiigfeiegfiii. Check local joins: gfe|i|ig, g|f|eii, i|g|fei, i|e|gf, i|ii. These transitions keep recurring chunks intact and avoid awkward letter clashes.

Verification / Alternative check:
Try the other choices; they create broken joins (e.g., repeated i merges or lost “gf” formations). "ifgie" uniquely retains the gfe / fei / eii interplay.

Why Other Options Are Wrong:
eifgi: Misplaces links and interrupts the gfe→ig handoff. figie: Overloads g-i adjacency and loses symmetry with eii blocks. ifige: Produces uneven spacing that breaks the fei repeats.

Common Pitfalls:
Focusing only on the first few blanks; the best option must validate every junction across all five placements.

Final Answer:
ifgie