Scott’s students changed more than one variable at a time— such as changing both the length and the weight—when they designed their experiments. Of the following, which statement best explains why...

Scott’s students changed more than one variable at a time— such as changing both the length and the weight—when they designed their experiments. Of the following, which statement best explains why they changed more than one variable, even though Scott had explained the process for controlling variables?

a. The students were cognitively passive during the group work.

b. The students constructed the idea of changing more than one variable at a time, because doing so made sense to them.

c. The students failed to reflect on the processes involved, so they used an inappropriate technique.

d. Scott grounded his learning activity in cognitive constructivism rather than social constructivism, so the learning activity was ineffective.