✨ ベストアンサー ✨
(A)還原句子會變成 The water was drawing with the girl.（水怎麼會跟著女孩一起抽？？？）明顯不合
(B)what指的是the thing which
還原後變成all the water the thing which，不合
還原成"The lady wanted the water."+"The girl carried the water with her."
➡️The lady wanted the water that the girl carried with her.