Which Is NOT a Technique Included in the NICHD Investigative

Which is NOT a technique included in the NICHD Investigative Interview Protocol?

A) Use closed-ended questions that only require a yes or no answer.
B) Avoid suggestive questions that include information not offered by the child.
C) Explain ground rules such as child's ability to say "I don't know" when appropriate
D) Ask children to describe a non-threatening activity as a way to practice narrating events.