Answer
(d) $ V_1 =( \frac {R_1}{R_1 +R_2})V$
Work Step by Step
$R_{eq} = R_1+R_2$
Current in the circuit is given as
$ I = \frac{V}{R_{eq}} = \frac{V}{R_1+R_2}$
Voltage across $R_1$ is
$ V_1 = IR_1 = \frac{V}{R_1+R_2}R_1$
$\implies V_1 =( \frac {R_1}{R_1 +R_2})V$
