This is in Differential Calculus. This is only multiple choice. Provide necessary solution. In case the answer is not in the choices, write the correct answer. Thank you and Godbless.

18. One particle starts at the origin and travels up the y-axis at 5 fts. Two seconds later, another particle starts at the origin and travels up the line y = x at the rate of 8 fts. At what rate are they separating 2 seconds after the second particle started? A) 5.25 fu/s C) 5.1 1 At/s B) 4.09 fu/s D) 4.42 fu/s