State if a continuous or a line spectrum is produced by each of the following: (a) A

Question:

State if a continuous or a line spectrum is produced by each of the following:
(a) A hot solid object;
(b) An excited, rarefied gas;
(c) A hot liquid;
(d) Light from a hot solid that passes through a cooler rarefied gas;
(e) A hot dense gas. For each, if a line spectrum is produced, is it an emission or an absorption spectrum?