Final answer:
Testimonies from witnesses were the evidence presented by Benjamin and Sarah Abbot to support their accusation that Martha Carrier was a witch during the Salem witch trials.
Step-by-step explanation:
The evidence that Benjamin and Sarah Abbot offered as proof that Martha Carrier was a witch comes from the testimonies of witnesses during the Salem witch trials. No mention is made of physical evidence or confessions from Martha Carrier as proof in the provided information. The Salem witch trials heavily relied on the testimonies of accusers, who claimed to have seen people engaging in activities they associated with witchcraft, such as riding broomsticks or floating through the air. Many of these accusations were driven by mass hysteria and a communal fear of non-conformity in their Puritan society.