On which of the following factors does the resistivity of a material depend ?

Answer: Option D

The resistivity $$\rho$$ of a material depends on multiple factors, and all of the mentioned options contribute to it:

Resistance of the conductor: The resistivity is directly related to the resistance through the formula $$R=\rho \frac{L}{A}$$, where $$R$$ is the resistance, $$\rho$$ is the resistivity, $$L$$) is the length of the conductor, and $$A$$ is the area of the conductor section.
Area of the conductor section: The area of the conductor section $$(A)$$ is present in the denominator of the resistance formula. As the area increases, the resistance decreases, and vice versa.
Length of the conductor: The length of the conductor $$(L)$$ is also present in the numerator of the resistance formula. As the length increases, the resistance increases, and vice versa.

Therefore, the correct answer is Option D: All of the above.