Please help do no waste answers In which case would a researcher need to submit his idea to the university’s IRB

A: if the study involves use of animal subjects
B: if the researcher is not a tenured professor at the IRBS university
C: if the study involves the use of human subjects
D: if the researchers results didn’t come out as he was anticipating

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