Here are some words translated from an artificial language.
I. relftaga means carefree
II. otaga means careful
III. fertaga means careless

Which word could mean "aftercare"?

In this language, the root word taga, which means care, follows the affix (relf, o–, or fer–). Therefore, in the word aftercare, the root word and the affix would be reversed in the artificial language. The only choice, then, is tagazen, because tagafer would mean less care.