[单选题]
A pure capacitor is connected to an Aievd;9g *2 hdmq a(4lw+zae9 wC power +m jen, v k 54715(ybgufbhvehsupply. In this circuit, the curren gm(un5 b,f1yk ej e5+b4h7vvht
A. leads the voltage by $90^{\circ}$.
B. lags the voltage by $90^{\circ}$.
C. is in phase with the voltage.
D. none of the given answers
