Four-year-old Gabriella is playing in the sand and dumps it in a pail (physical development) then fills three smaller containers from the pail and says she is measuring flour for a cake (cognitive). Mitzu is near and Gabriella asks her to play (social). This is an example of which of the following principles of development?

a) Nature vs. Nurture
b) Continuous vs. Discontinuous
c) Stability vs. Change