Which of the Following Would Necessitate the Reopening of an Estate

Which of the following would necessitate the reopening of an estate?

A) The location of additional omitted property of the decedent after the estate has been closed and discharged
B) A creditor seeking to collect a valid but undischarged claim
C) The personal representative committed fraud or inadequate disclosure to a creditor related to the settlement of the decedent's estate
D) A claim against a decedent's estate that arose before the decedent's death is presented six months after the date of the first publication of notice to creditors