How many grams of protein corresponds to 25% of total calories on an 1,800-calorie diet?

To determine how many grams of protein corresponds to 25% of total calories on an 1,800-calorie diet, you need to calculate 25% of 1,800 calories first.

Calculating 25% of 1,800 calories gives:

1,800 calories * 0.25 = 450 calories from protein.

Since proteins provide 4 calories per gram, you can find the grams of protein by dividing the total calories from protein by the calories per gram of protein:

450 calories ÷ 4 calories/gram = 112.5 grams.

Rounding this figure to the nearest whole number results in approximately 113 grams of protein.

This means that the choice indicating 113 grams is correct, as it reflects the appropriate calculation based on a standard 1,800-calorie diet where 25% of calories come from protein. The other choices either represent amounts that do not properly derive from the 25% calculation or align with different percentages of the total caloric intake.