What invention is associated with Robert Fredrick and C.A. Trump?

The invention associated with Robert Fredrick and C.A. Trump is the corpse cooler. This innovation played a significant role in the preservation of deceased bodies, particularly before the advent of modern refrigeration techniques. The corpse cooler was designed to slow down the decomposition of bodies, allowing for a longer period of time for funerals and viewings, as well as improving the overall conditions under which the deceased could be kept prior to burial.

This invention came at a pivotal moment in history when the transportation of bodies for burial or cremation needed to accommodate a delay in time without compromising the dignity or appearance of the deceased. The corpse cooler laid the groundwork for subsequent developments in embalming and preservation methods that would enhance mortuary practices and public health standards.

The other options relate to aspects of body preservation or funeral practices but do not specifically pertain to the significant contribution of Fredrick and Trump as directly as the corpse cooler does.