Final answer:
A patient would be identified at risk on the CDC and Prevention growth chart if their weight for length/height is below the 3rd percentile.
Step-by-step explanation:
When performing nutrition screening for pediatric patients, a patient would be identified at risk according to the CDC and Prevention growth chart if they exhibit weight for length/height below the 3rd percentile (option D).
This is because a weight for length/height below that percentile could indicate undernutrition or other health issues. In contrast, a BMI of the 80th percentile, length/height for age of the 75th percentile, or weight for age of the 25th percentile would typically not signal an elevated risk by CDC growth chart standards, as long as those measurements are proportionate and consistent with the child's growth patterns.