Which of the following options refers to a rigid container designed specifically for encasement of human remains?

A casket is indeed defined as a rigid container designed specifically for the encasement of human remains. Its primary purpose is to provide a dignified resting place for the deceased and to facilitate the process of burial or cremation. Caskets can vary widely in design, materials, and pricing, and they are typically made to aesthetically present the deceased and accommodate various funeral service preferences.

An alternative container, while also used to encase human remains, is usually a simpler and less ornate option than a casket, and it may not be classified as "rigid" in the same way. Outer burial containers serve a different function; they are designed to support the weight of the earth above a grave and protect the casket from the surrounding environment, rather than encasing the remains themselves. A general price list is essentially a document that outlines the prices of funeral goods and services but does not describe any physical product related to the encasement of human remains.