18. Clark bought 5 apples and 8 oranges. The total amount she paid was at least Php 240. If x represents the cost of each apple and y the cost for each orange, which of the following mathematical statements represents the given situation? A. 5x + 8y 2 240 C. 5x + 8y > 240 B. 5x + 8y s 240 D. 5x + 8y < 240