To determine which graph represents the variation of resistivity $(\rho)$ with temperature $(T)$ for copper, we need to understand the behavior of metals.$\\$For metals like copper, resistivity increases with temperature. This is because as temperature rises,$\\$the lattice vibrations increase, causing more collisions for the electrons and thus increasing resistivity.$\\$The relationship is approximately linear over a moderate temperature range and can be expressed as:$\\ \rho = \rho_0 (1 + \alpha T) \\$