What Is the Causal Relationship Between Consumption and ADHD

Multiple Choice

What is the causal relationship between consumption and ADHD?

A) Both food allergies and sugar have been shown to be major causes of ADHD.
B) Only food allergies have been shown to be a major cause of ADHD.
C) Only sugar consumption has been shown to be a major cause of ADHD.
D) Neither food allergies nor sugar are major causes of ADHD.