- A utensil is a kind of tool for eating
- A fork is a kind of utensil
- Therefore, a fork is a kind of tool for eating

- A fork is a kind of tool for eating
- Using tools is a learned characteristic
- Therefore, using a fork to eat is a kind of learned characteristic

Hence, using a fork to eat is a kind of learned characteristic
Which behavior is a learned behavior?
- A utensil is a kind of tool for eating 
- Using tools is a learned characteristic 
- A fork is a kind of utensil