Based on Current Knowledge About Cancer, Its Prevalence, and Factors

Based on current knowledge about cancer, its prevalence, and factors related to its progression, which statement is accurate ?

A) Cancer is a specific disease with relatively clear diagnostic criteria.
B) The negative emotions of people who have received a diagnosis of cancer may be the result of the knowledge of their disease rather than their personality traits.
C) Because cancer generally develops quickly over a short period of time, it is possible to determine a temporal relationship between its occurrence and specific moods.
D) Retrospective studies allow researchers to determine whether emotions related to cancer came before or after the diagnosis.