Resistance of a wire using the formula R = ρL/A

Steps:

• Identify the formula for resistance: R = ρ L / A, where ρ is resistivity, L is length, and A is area.
• Note that length L = 3.5 × 10^{-3} m and area A = 6.25 × 10^{-7} m² are provided.
• Recognize that resistivity ρ for gold is not given in the problem.
• Conclude not enough information to calculate numerical resistance.

Why C is correct:

• C is stated as correct, but without ρ, no option can be verified using the resistance formula.

Why the others are wrong:

• A, B, and D cannot be confirmed without the missing resistivity value.

Final answer: Not enough information.