Answer:
Farmer John showed his chicken "A GOOD EGG SAMPLE"
Step-by-step explanation:
The key is - questions that:
Are a function: 1, 3, 5, 7, 9, 10, 11 and 13.
Not a function: 2, 4, 6, 8, 12 and 14.
When circling the right letter in the chart according to the number of the question (on the top row) and the answers, the letters together form the answer, which is: A good egg sample. So: Farmer John showed a good egg sample to his chicken when she wouldn't lay any eggs.