Answer
(d) four times
Work Step by Step
We know that
$ V=IR \\ R=\frac{V}{I}$
We have
$ V_A =2V ,\space I_A = \frac{1}{2} I \\ V_B =V, \space I_B = I$
now $R_B = \frac{V}{I}\\ R_A = \frac{2v}{\frac{1}{2}I} = 4\frac{V}{I} = 4R_B$
Hence option (d) four times, is correct
