Which spectra in the figure below is made by a hot tenuous gas?

In a figure depicting various spectra, the spectrum produced by a hot tenuous gas typically appears as a series of bright emission lines against a dark background. This is due to the gas's atoms emitting light at specific wavelengths when they transition between energy levels. The presence of distinct emission lines indicates that the gas is hot and sparse, distinguishing it from other types of spectra, such as continuous or absorption spectra.