A steel watch that is old and costly has become magnetised. The owner would like to wear the watch again, so it needs to be demagnetised. Which method is the most suitable for doing this?
- AInsert the watch in a solenoid that carries alternating current and then slowly remove it.
- BInsert the watch in a solenoid that carries direct current and then slowly remove it.
- CPass alternating current through the watch.
- DPass direct current through the watch.