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Two moving coil galvanometers G1 and G2 ...

Two moving coil galvanometers `G_1` and `G_2` have the following particulars respectively
`N_1=30,A_1=3.6xx10^(-3)m^(2),B_1=0.25T`
`N_2=42,A_2=1.8xx10^(-3)m^(2),B_2=0.50T`
The spring constant is same for both the galvanometers. The ratio of current sensitivities of `G_1` and `G_2` is:

A

`5:7`

B

`7:5`

C

`1:4`

D

`1:1`

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