[单选题]
A 500-W device is conl )no -q*i,.q*auqz o, u1uq0k1w 5alzcjfi4inq ym c,6/mp cm91,)v2 izovl+mex 7blxjtp6/dected to a 120-V ac power source. What is the peak voltage zx1mey,6/2pd6,pt +)7ol jcl9q v ibv c/mmmxacross this device?
A. $4.2 \; V$
B. $5.9 \; V$
C. $120 \; V$
D. $170 \; V$
