Correct Answer: high resistance in series

Solution : The correct option is high resistance in series.

To transform a galvanometer into a voltmeter, a high-resistance element in series with the galvanometer, often referred to as a multiplier or shunt resistor is used. This additional resistor serves the purpose of controlling the current passing through the galvanometer when it is used for voltage measurements. This precautionary measure prevents the galvanometer from drawing excessive current, safeguarding it against potential damage, especially when measuring higher voltage levels.