Two copper wires $A$ and $B$ have the same diameter and lengths of $3 \ cm$ and $5 \ cm$ respectively. If their resistances are $R_A$ and $R_B$ and their resistivities are $\rho_A$ and $\rho_B$,then which of the following is correct?

• A
  $R_A > R_B$,where $\rho_A > \rho_B$
• B
  $R_A > R_B$,where $\rho_A < \rho_B$
• C
  $R_A > R_B$,where $\rho_A = \rho_B$
• D
  $R_A < R_B$,where $\rho_A = \rho_B$