Final answer:
According to William H. Sheldon, the mesomorph body type is most often associated with criminality, although his theory lacks empirical support and is considered controversial within modern criminology.
Step-by-step explanation:
William H. Sheldon, a psychologist who developed a theory on body types and temperament, suggested that the mesomorph body type is most likely to be associated with criminality. According to his theory, mesomorphs, characterized by a muscular and athletic build, are more prone to aggressive and assertive behavior that could potentially lead to criminal activities. Sheldon's typology includes three body types: endomorphs, who are rounder and more relaxed; mesomorphs, who are muscular and more active; and ectomorphs, who are slender and more introverted or restrained. The concept posed by Sheldon, however, is considered controversial and lacks empirical support, as contemporary research does not validate the correlation between body type and criminal behavior.