[单选题]
A pure capacitor is connected to an AC power supply. i.p yy +k 5fxoy 9gnf(,/k0cozIn this cir0;srpnasuu axl) 26l. cuit, the currep)rs u.6l0al asux n;2nt
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
