Which answer best supports the statement, "china's government can be considered an oligarchy"? a) the government has traditionally existed as a command economy. b) the only political party allowed to exist is the communist party of china. c) the right to vote is given to all citizens who are at least 18 years of age. d) the government is ruled completely by one person who has unchecked authority.

What was piaget's explanation as to why preschool-age children in the preoperational stage make errors on tasks requiring conservation? a) preschool children's tendency toward centration prevents them from focusing on other relevant features of a situation b) preschool children have not yet developed numerical understanding; therefore, different amounts are meaningless c) preschool children's neural-visual network is not fully matured d) preschool children have not lived long enough and accrued enough experience to know the difference between quantities