You read a research article about abstract thinking and academic achievement in a professional journal. The researchers report a correlation of .65 between the amount of abstract thought students demonstrate and the grade-point-averages they earn. You should conclude that:

The correct answer is a. when they started making tools that will them in cultivating lands, they could raise crops and that made them attached to one place for a longer period of time. after that, they started domesticating animals and building their own permanent settlements that resemble the ones we have today.