(A) D4, F6, H8, J10, ?
Letters:
D → F → H → J → L (+2 each)
Numbers:
4 → 6 → 8 → 10 → 12 (+2 each)
\[ \boxed{(A)=L12=(IV)} \] (B) 2B, 4C, 8E, 14H, ?
Numbers:
2 → 4 → 8 → 14 → 22
Differences: +2, +4, +6, +8
Letters:
B → C → E → H → L
Differences: +1, +2, +3, +4
\[ \boxed{(B)=22L=(III)} \] (C) 3F, 6G, ?, 18L, 27P
Numbers:
3 → 6 → 11 → 18 → 27
Differences: +3, +5, +7, +9
Letters:
F → G → I → L → P
Differences: +1, +2, +3, +4
\[ \boxed{(C)=11I=(II)} \] (D) W144, ?, S100, Q81, O64
Numbers:
144, 121, 100, 81, 64
Squares descending:
\[ 12^2, 11^2, 10^2, 9^2, 8^2 \] Letters:
W → U → S → Q → O (−2 each)
\[ \boxed{(D)=U121=(I)} \]