By 2 to 3 months of age, most infants expect people to react positively when the infants initiate a behavior, such as a smile or a vocalization. this finding has been discovered using a method called the:

The method in question is called the still-face paradigm.
Infants like to see the reaction in other people when they are doing something - smiling, laughing, vocalizing, pointing at something. However, when this paradigm was used, people would just stare at the child emotionlessly. Suddenly, the child would grow anxious and desperately seek the person's attention, which tells us a lot about their expectations. 

I think the correct answer from the choices listed above B. The federal bureaucracy  is made up of all executive branch employees. It consists of the roughly 500 departments, agencies, administrations, authorities, and commissions that carry out responsibilities assigned to them through Congressional legislation.