Which food item has the highest calorie content from the options provided?

The food item with the highest calorie content among the options is the Whopper with cheese. A typical Whopper with cheese contains a significant amount of calories, primarily due to its large beef patty, cheese, mayonnaise, and other toppings, as well as the burger bun itself.

In comparison, garden salads generally have low calorie content, especially if they lack high-calorie dressings or toppings like cheese or nuts. Six chicken tenders can also be calorie-dense, but they typically do not reach the calorie level of a large fast food burger with cheese. French fries, while also relatively high in calories due to their fat content from deep frying, usually do not exceed the total calories found in a Whopper with cheese, especially if portion sizes are taken into account. Hence, the Whopper with cheese stands out as the most calorie-rich option.