Step 1: Concept
A voltmeter must have a very high resistance to ensure it does not draw significant current from the circuit.
Step 2: Meaning
A galvanometer has low internal resistance.
Step 3: Analysis
To increase the overall resistance and limit the current, a large resistor (multiplier) is added.
Step 4: Conclusion
This high resistance must be connected in series with the galvanometer.
Final Answer: (A)