In the circuit shown in figure reading of voltmeter is V1 when only S1 is closed, reading of voltmeter is V2 when only S2 is closed and reading of voltmeter is V3 when both S1 and S2 are closed. Then
(a) V3>V2>V1
(b) V2>V1>V3
(c) V3>V1>V2
(d) V1>V2>V3