Us citizens are guaranteed free access to which level of education?
primary
secondary
post secondary
both a & b

Both A and B, primary and secondary are elementary school through High school. Post Secondary is University/College and that costs money (like a lot up to 60,000 usd at at a prsigious University like Harvard/Yale)

the technology changed agriculture in an impacting manner since many people left the field work by a cellular or other technological appliances

i need !