Question

mental age is an age by which ______. one can complete age - related problems one has acquired certain skills one can perform certain skills one shows signs of graduating from high school

Explanation:

Mental age refers to the level of cognitive development, often measured by the age - equivalent performance on intelligence tests. It is about the age at which a person can perform certain cognitive or skill - related tasks. The option “one can perform certain skills” aligns with the concept of mental age, as it is related to the ability to perform tasks (skills) at a level typical of a certain age group. The other options are less accurate: “completing age - related problems” is too narrow, “acquired certain skills” focuses on acquisition rather than performance, and “signs of graduating from high school” is not related to the concept of mental age.

Answer:

one can perform certain skills