Let A(t) be the amount of carbon in grams (g), remaining t seconds (s) after the start of a chemical reaction. What does it mean to say that A'(8) = -2? O A. After 8 seconds, there are 2 grams of carbon remaining. O B. After 8 seconds, the amount of carbon has decreased by 2 grams. O C. The slope of the tangent line to the graph of A(t) when t=8 seconds is 2 g/s. O D. After 8 seconds, the amount of carbon is decreasing at 2 g/s. O E. When 8 grams of carbon remain, the rate of change of the amount of carbon remaining is - 2 g/s