In the Right-Hand Thumb Rule, the thumb is directed towards the direction of:

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### Explanation

1. The Right-Hand Thumb Rule (for a straight current-carrying conductor) states: hold the conductor with your right hand so that the thumb points along the conductor and the fingers wrap around it.
2. The thumb gives the direction of the conventional current (flow of positive charge), usually denoted $I$.
3. The curled fingers show the direction of the magnetic field lines encircling the conductor.
4. Therefore the thumb indicates the direction of the current, not the electric field, motion of the conductor, or the magnetic field (the magnetic field is shown by the fingers).

FINAL_ANSWER: a

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