Mary is helping her son, Dean, put together a difficult, but manageable, puzzle. When Dean tries to insert a piece in the wrong place a few times, Mary points to the bottom of the puzzle and says, "Does it go down here?" Mary is engaging in

scaffolding

Explanation:

Scaffolding is a  method of instruction  in which teachers shows the process of solving a problem to the students and explain the steps as the students proceeds forward. After making a few  explanations, the instructor  then leaves students to work independently but help him only when he feels that is student is stuck and will need guidance. .

Here Dean was stuck while solving the puzzle and mary came to her rescue. This is clear example of Scaffolding

answer; /// all of the above;

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