The correct answer is Choice C.
Use the formula for the area of a triangle and the given base length and height for evaluation of the area.
Choice A is incorrect and may result from simply adding the length and the width.
Choice B is incorrect and may result from finding the perimeter of the rectangle.
Choice D is incorrect and may result from square the sum of the length and the width.
✨ Expert's Tip ✨
The area of a rectangle is the product of the length and width of the rectangle.