The evidence from the text that supports the answer in Part A is that Transmitters are used “to keep people like George [Harrison's father] from taking unfair advantage of their brains.”
An evidence refers to the detail in a text which helps to validate a claim which was made to show that it is true.
In this case, it can be deduced that the evidence from the text which helps to support the claim made in the first part is that transmitters are used to prevent people from taking unfair advantage.
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