If a boy believed that the only variable that affected the distance a ball traveled when thrown was the force with which it was thrown and then conducted a biased "experiment" that proved his assumption which developmental phenomenon according to piaget is involved?
a. object permanence
b. conservation
c. concrete operations
d. formal operations

c. concrete operations

Explanation:

Concrete operations: This is the third stage in the cognitive development theory which is given by Jean Piaget. This stage starts in middle childhood from the age of seven and lasts around eleven years. It is distinguished by the development of rationale, logical, and organised thinking in an individual.

According to Piaget, the concrete operations developmental stage is involved.

probably 3 since archeologists and historians don’t understand there writing.