3) 2) 1) i think this is the right answer but c looks correct too\
A. a disease that affects a person for a long time
It is referred as <span>zone of proximal development. The zone of proximal development enables a person to distinguish what he or she is capable of with help towards others and without it. It is somehow related to the given sentence above where it shows how children can do on their own and with the help of another person.</span>
