The function f(x)=- 6.5x2-42.1x+934 +144 models the pH level, f(x), of a mouth x minutes after eating food containing sugar. The graph of this function is shown to the right. Complete parts (a) through (e). 12 24 36 48 Number of Minutes after Eating 60 Question View e. Use the graph to describe what happens to the pH level during the first hour. OA. The pH level starts at 6.5 then decreases rapidly for 12 minutes. For the remainder of the hour the pH level gradually increases back toward 6.5. OB. The pH level starts at 4.7 then decreases rapidly for 12 minutes. For the remainder of the hour the pH level gradually increases back toward 4.7.