To determine the missing terms in the given alphabet series:
\[
a, d, c, f, \_, h, g, \_, i
\]
1. Observing the odd-positioned letters:
- \( a, c, \_, g, i \)
- The pattern follows: \( +2, +2, +2, +2 \).
- Missing term: e.
2. Observing the even-positioned letters:
- \( d, f, h, \_ \)
- The pattern follows: \( +2, +2, +2 \).
- Missing term: j.
Thus, the missing terms are e and j, confirming the correct answer as (A) e, j.