The band spectra (characteristic of molecular species) is due to emission of radiation from which state of matter?

In the absorption spectrum of $Na$,the missing wavelength$(s)$ are:

$A$ neutron collides head-on with a stationary hydrogen atom in its ground state.

The splitting of a spectral line into groups under the effect of an electric or magnetic field is called:

$A$ beam of ultraviolet light of all wavelengths passes through hydrogen gas at room temperature,in the $x-$ direction. Assume that all photons emitted due to electron transition inside the gas emerge in the $y-$ direction. Let $A$ and $B$ denote the lights emerging from the gas in the $x$ and $y$ directions respectively.

Match the following:

$1$. Burning candle	$i$. Line spectrum
$2$. Sodium vapour	$ii$. Continuous spectrum
$3$. Bunsen flame	$iii$. Band spectrum
$4$. Dark lines in solar spectrum	$iv$. Absorption spectrum