Final answer:
The MacDonald Triad includes animal cruelty as a possible indicator of future violent behavior, but without specific context, the truth of the statement regarding clear evidence in someone's youth cannot be determined.
Step-by-step explanation:
The MacDonald Triad is a set of three behavioral characteristics that some researchers have suggested may be indicators of an individual's propensity for violent tendencies later in life, especially towards other humans. These behaviors are animal cruelty, obsession with fire setting, and persistent bedwetting past a certain age. This study was conducted by forensic psychiatrist J.M. MacDonald in 1963. While the MacDonald Triad has been given attention in the fields of psychology and criminology, it is important to note that it is regarded with some skepticism as its predictive value has been questioned in subsequent research. Animal cruelty in youth, according to the triad, is seen as a potential warning sign of future aggressive behavior. If the provided statement in the question is claiming that there is clear evidence of animal cruelty in someone's youth as part of the MacDonald Triad, without specific context or evidence, one cannot determine its truth value. Therefore, based on the information given, we cannot affirm if the statement is True (A) or False (B).