To activate prior knowledge means to Remember what you know about a topic. Thus, option "B" is correct.
In education, prior knowledge is the learning that a kid concludes before entering a classroom for the foremost time. For example, one kid may enter kindergarten having already learned to recognise different shades and to count to ten, based on their actions at home with a caretaker before joining the school.
Thus, option "B" is correct.
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