Final answer:
To ensure food is properly cooked, it's important to use a thermometer to check that it reaches the safe internal temperature, which is the most reliable method to determine doneness and prevent foodborne diseases.
Option 2.
Step-by-step explanation:
When preparing food, such as making a pizza, you can tell it is done primarily by checking the food temperature using an appropriate food thermometer to ensure it reaches a safe internal temperature, which is a reliable method for killing any bacteria it contains.
While you might look for the crust turning light brown or the cheese melting, these indicators of doneness are more subjective and can vary.
For foods that require specific internal temperatures, such as meats and baked goods, relying on the manufacturer's or recipe's instructions and verifying the temperature with a thermometer are both important safety measures against foodborne diseases.