My answer would be B, because studying is the better way know more deeper about how to start working, so if you want an employ and you have a degree it's easiest than when you don't have it, now there are people that not even studied and they are rich, but this doesnt apply for all the cases.
It is believed that the majority of the petroglyphs were carved from about 1300 through the late 1680s.
I can’t answer this question because you need evidence, so you should go read your article
