Recall the relative resistivities of the given conductors

At room temperature, the approximate resistivities are:

$\rho_{\text{Cu}} \approx 1.7 \times 10^{-8}\ \Omega\,\text{m}$ $\rho_{\text{Al}} \approx 2.7 \times 10^{-8}\ \Omega\,\text{m}$ $\rho_{\text{W}} \approx 5.6 \times 10^{-8}\ \Omega\,\text{m}$ $\rho_{\text{Hg}} \approx 9.6 \times 10^{-7}\ \Omega\,\text{m}$

Arrange them in increasing order

From the above values:

$\rho_C < \rho_A < \rho_T < \rho_M$

Now check each option

• Option A: $\rho_C > \rho_A > \rho_T$

  This is false, because actually $\rho_C < \rho_A < \rho_T$.

• Option B: $\rho_M > \rho_A > \rho_C$

  This is true, because mercury has the highest resistivity among these, aluminium has greater resistivity than copper.

• Option C: $\rho_A > \rho_T > \rho_C$

  This is false, because $\rho_T > \rho_A$.

• Option D: $\rho_A > \rho_M > \rho_C$

  This is false, because $\rho_M > \rho_A$, not the other way around.

Final answer

The correct option is:

$\boxed{\text{B}}$

Comparison with stored answer

Stored correct answer: B

My derived answer: B

Hence, they agree.