Is lead chloride ( pbcl2) solution, substance, homogenous mixture or heterogeneous mixture?

Lead chloride solution is a SUBSTANCE.
All the matters in the universe can be divided into two basic classes, these are pure substances and mixtures. A pure substance can be an element or a compound. Mixtures are made up of two or more different particles while pure substances are made up of identical particles. Lead chloride is an inorganic compound and is considered to be a pure substance; it also occurs as a minerals. 

Perimeter? wheres the answers

The answer is b because c don't explain why the moths are on them and it isn't a because as we know only one species of moth does this