Qual sufixo adjetivo seria mais adequado nas frases abaixo?

I Janet is ________________________ (RESPONSE) for the whole Accountancy Department.

II. The cave is only _________________ (ACCESS) by boat.

III. Workers at nuclear plants are constantly screened to avoid exceeding maximum ____________________ (PERMIT) levels of radiation.

IV. Many politicians’ activities cannot be morally ___________________ (DEFEND)