Answer:
accuracy motive
Explanation:
Accuracy motive is a process of thinking in which you are making a decision for yourself motivated by the experiences, pieces of knowledge and belives you have before that.
In this particular example, Beth wants to see for herself the accuracy of her friends' statement about the hamburgers' substance. Therefore, Beth strives to find evidence that would convince her of either correctness or wrongness of the claim, so she can herself make a decision that she will consider being true and correct.