Which of the Following Is True of Metamemory

Which of the following is true of metamemory?

A) Before the age of 8, children have no understanding of their own memory processes.
B) When shown a set of 10 pictures, 5-year-olds know they cannot remember all of them.
C) 5- and 8-year-olds have approximately equivalent knowledge of their own memory abilities.
D) 5-year-olds have some understanding of their own memory process but not as much as do 8-year-olds.