Final answer:
The closest proper temperature of a flat top grill given the options is 400°F. It is ideal for cooking most foods, though the temperature requirements can vary based on what is being prepared.
Step-by-step explanation:
The proper temperature of a flat top grill is typically between 350°F and 400°F for cooking most foods. However, if you are looking for the specific options given in the question, the closest proper temperature to cook on a flat top grill would be 400°F (option a). Cooking temperatures can vary depending on the food being prepared. For instance, delicate items like eggs or pancakes are often cooked at the lower end, around 350°F, while searing meats might require temperatures at the higher end, closer to 400°F. It is important to note that the highest temperature setting on many household ovens is the broil setting at 500°F, which is generally too high for a flat top grill and could burn food rather quickly.