Which of the following actions is unlawful concerning a deceased body?

Performing an autopsy without permission is indeed considered unlawful. Autopsies, or post-mortem examinations, require explicit consent from the deceased person's family or legal representatives in almost all circumstances. This is rooted in ethical and legal standards surrounding bodily autonomy and the right to determine what happens to one’s body after death. The necessity of permission ensures respect for the deceased's dignity and acknowledges the wishes of the next of kin.

In contrast, preparing a body for cremation, storing it in a morgue, and embalming are generally acceptable practices within the funeral profession, provided they adhere to legal and regulatory standards. These activities are part of a funeral director's duties and can be performed legally as long as they are conducted appropriately and with the necessary authorizations when required.