The correct answer is D) histographical source.
The term that refers to a description of a historical person that is written by a historian who studied the person long after her death is a histographical source.
A histographical source serves historians to write about history based on deeply examined sources, documents, archives, photographs, and books validated by proper research. Histography includes the sources, techniques, and different theories that are used to investigate an event, and incident, a character or a location in a determined time in history.