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.
-During Anam's second visit to the lab (when he is 2.5 years old) ,the researchers notice he ___________ and code this as an indication that he has reached _________ second stage of development.

A) cries and sucks his thumb every time he gets upset; Erikson's
B) cries if a toy is taken away from him unexpectedly; Freud's
C) becomes upset if someone tries to help him put on his shoes; Erikson's
D) becomes upset if his parents are paying attention to his sister; Freud's