Answer:
a) 響 -> 章 -> 古 -> 鳴
響 KYOU, hibi(ku) - sound, resound, affect, echo
章 SHOU - chapter, badge, mark
古 KO, furu(i) - old
鳴 MEI, na(ku), na(ru)(rasu) - cry, sing, howl, ring
b) 型 -> 埋 -> 野 -> 預
型 KEI, kata - model, form
埋 MAI, u(maru), u(meru), u(moreru) - bury, be buried, filled up
野 YA, no - field, plain
預 YO, azu(keru), azu(karu) - entrust