The correct answer is: A. High resistance in parallel.
A galvanometer is an instrument that measures electric current. It is a very sensitive instrument and can be easily damaged by high currents. To convert a galvanometer into a voltmeter, we need to increase its resistance. This can be done by connecting a high resistance in parallel with the galvanometer. The high resistance will limit the current flowing through the galvanometer, making it more robust and able to measure higher voltages.
Option B is incorrect because a low resistance in parallel would decrease the resistance of the galvanometer, making it more sensitive to current and less able to measure high voltages.
Option C is incorrect
because a high resistance in series would increase the resistance of the galvanometer, making it less sensitive to current and more able to measure high voltages. However, this is not the desired effect when converting a galvanometer into a voltmeter.Option D is incorrect because a low resistance in series would decrease the resistance of the galvanometer, making it more sensitive to current and less able to measure high voltages.