A sample of rain has pH 4.2. Take $10^{1.4}=25.1$ and $K_w=1.0\times 10^{-14}$ at the temperature of measurement. Which statements are correct?

1. AThe sample qualifies as acid rain.
2. BIts $[\mathrm{H}{}^{+}]$ is about 25 times that of rain with pH 5.6.
3. CIts $[\mathrm{H}{}^{+}]$ is about 1.4 times that of rain with pH 5.6.
4. DIts $[\mathrm{OH}{}^{-}]$ is $1.0\times 10^{-9.8}\mathrm{mol}{\mathrm{L}}^{-1}$.