Moving coil galvanometers $M_{1}$ and $M_{2}$ have resistance, number of turns, area of coil, and magnetic field as follows:
$R_{1}=10 \ \Omega, R_{2}=14 \ \Omega, N_{1}=30, N_{2}=42$
$A_{1}=3.6 \times 10^{-3} \ m^{2}, A_{2}=1.8 \times 10^{-2} \ m^{2}, B_{1}=0.25 \ T, B_{2}=0.50 \ T$
(Spring constants are same for both galvanometers).
The ratio of $(i)$ current sensitivity and (ii) voltage sensitivity for galvanometer ($M_{2}$ to $M_{1}$) is respectively:

• A
  $1: 1, 1.4: 1$
• B
  $1: 1.4, 1: 1$
• C
  $4: 1, 1: 1$
• D
  $1.4: 1, 1: 1$