You are given the vx–t graph for an object moving along the x-axis with constant acceleration. Which of the following could you not determine from the information given in this graph alone?
选项：

A:the object’s x–acceleration at any time t ;
B:the object’s x–velocity at any time t ;
C:the object’s position at any time t ;
D:more than one of the above;
E:misleading question — you could determine all of these from the vx–t graph alone