Answer:
The answer is C, wrapping the wire around the nail more times
Explanation:
The more a wire is wrap around the nail, the more electromagnet field becomes stronger, so long as there is more wire unwound, so that the battery can be attached.
For Gazala to be able to pick up four clips at the tip of the wall, Gazala has to wrap the wire around the nail more often that it was done or wrapped before. This is true, because the electromagnet having an attractive force is directly proportional to the magnetic field square that is generated by a current running through the coiled wire.
The magnetic field as stated already, is directly proportional to the number of the wire turns around the magnetic element, it is important to increase the number of turns of the wire, so that electromagnet strength would be greater
