C

Step 1: Understand the context of the question, which asks about the direction of magnetic lines of force produced by a direct current in a conductor.
Step 2: Recall that the Right-Hand Palm Rule states that if you point your thumb in the direction of the conventional current (from positive to negative), the direction your palm faces gives the direction of the magnetic field lines around the conductor.
Step 3: Analyze the options:

• Lenz’s Law describes the direction of induced currents and does not pertain to the current-carrying conductor's magnetic field.
• Fleming’s Left Hand Rule is used to find the direction of motion of a conductor in a magnetic field.
• Right Hand Palm Rule correctly indicates the direction of magnetic lines of force.
• Maxwell’s Law refers to the equations governing electromagnetism.

Conclusion: Therefore, the correct answer is option C, the Right Hand Palm Rule.