When Presho Was a Newborn, Her Parents Consented to Enrol

When Presho was a newborn, her parents consented to enrol her as a participant in a longitudinal study exploring childhood development. Every year in April, her parents take her to the university in their city so she can participate in some short experiments. When Presho's younger brother, Anam, is born three years later, their parents decide to enrol him as well, and he participates in the same experiments as his sister, also during their visit in April.
-At the beginning of the session,the researchers pour water into a cup and draw a line on the cup to indicate the level the water has reached.They put the water in the freezer until just before the end of the session.The water has frozen and shows the ice reaches above the marked line.If Presho has reached the ____________,then she will say that compared to before ____________.

A) preconventional stage; there is more water in the cup
B) concrete operational stage; there is more water in the cup
C) conventional stage; the same amount of water is in the cup
D) formal operational stage; the same amount of water is in the cup