A historian is examining two competing theories about the decline of the Mayan civilization. Theory A posits that prolonged drought led to widespread agricultural collapse and subsequent societal breakdown. Theory B suggests that internal warfare and political instability were the primary drivers of decline, exacerbated by environmental pressures. The historian finds archaeological evidence showing a significant increase in defensive structures and mass graves containing victims of violence during the period of decline. Additionally, analysis of skeletal remains from this era indicates widespread malnutrition, but also a higher proportion of individuals with healed injuries consistent with combat. Which of the following statements best describes how this new evidence relates to the two theories?

1. AThe evidence disproves both theories by introducing entirely new factors.
2. BThe evidence strengthens Theory B while also suggesting a contributing role for environmental factors.
3. CThe evidence is inconclusive and equally supports both Theory A and Theory B.
4. DThe evidence primarily supports Theory A by confirming agricultural collapse.