To solve this problem, we need to analyze the circuit with the given resistances of the voltmeters.$\\$Given:$\\$• Voltmeter A has resistance $R. \\$• Voltmeter B has resistance $1.5R. \\$• Voltmeter C has resistance $3R. \\$The voltmeters are connected in parallel between points X and Y.$\\$In a parallel circuit, the potential difference across each component is the same.$\\$Therefore, the potential difference across each voltmeter is equal to the potential difference between X and Y.$\\$Thus, the readings of the voltmeters are:$\\ V_A = V_B = V_C \\$This corresponds to Option 4.