heidi is taking an online class with timed exams, and heidi complains that the exams are not fair to her because she reads more slowly than the average student. heidi’s instructor tells her that reading speed and comprehension are skills that can be improved with practice, and encourages her to overcome this obstacle instead of using it as an excuse. heidi’s instructor is encouraging her to adopt group of answer choices a fixed mindset. a growth mindset. functional fixedness. creativity.