When the Following Equations Are Balanced Using the Smallest Possible $\rightarrow$

When the following equations are balanced using the smallest possible integers, what is the number in front of the underlined substance in each case?
-Pb(s) + AgNO₃(aq) $\rightarrow$ Pb(NO₃) ₂ + Ag(s)

A) 1
B) 2
C) 4
D) 5
E) 6