【正确答案】 C

【答案解析】To correctly answer this question, remember that the area of a triangle is calculated using the formula [*] , where b is the base of the triangle and h is the height of the triangle. The base of the triangle extends from the origin in the (x,y) coordinate plane, (0,0) to the point (5,0). This means that the base is 5. The height of the triangle extends from the origin in the (x,y) coordinate plane, (0,0) to (0,4). The height of the triangle is 4. Plug these values into the formula:
[*]