One similarity between the developmental theories of Piaget and Vygotsky is that they are both

A. constructivist theories of learning throught interaction with the environment
B. objectivist theories of development throught the resolution of crisis
C. stage theories of development as a series of steps on the social ladder
D. Pyramid theories of learning specifying the relationship bewteen needs and goals **

To determine the correct answer, let's break down the question and analyze the given options.

The question asks for a similarity between the developmental theories of Piaget and Vygotsky. Both Piaget and Vygotsky were influential developmental psychologists who proposed theories about how children learn and develop.

Let's analyze each option:

A. Constructivist theories of learning through interaction with the environment:
Both Piaget and Vygotsky proposed constructivist theories of learning. Piaget believed that children actively construct knowledge through interaction with their environment, while Vygotsky emphasized the role of social interaction and cultural influences in cognitive development. So, option A seems to be a possible answer.

B. Objectivist theories of development through the resolution of crisis:
The term "objectivist" does not accurately represent the theories of either Piaget or Vygotsky, so option B is not a valid choice.

C. Stage theories of development as a series of steps on the social ladder:
While both Piaget and Vygotsky proposed stage theories of development, their stages are not related to a social ladder. Piaget's stages focus on cognitive development, while Vygotsky's stages emphasize socio-cultural influences on learning. So, option C is not correct.

D. Pyramid theories of learning specifying the relationship between needs and goals:
This option does not accurately describe the theories of Piaget or Vygotsky, so option D is not correct.

Considering the analysis, the correct answer is:
A. Constructivist theories of learning through interaction with the environment.