Hello, I am currently stuck a chemistry problem (linked below) and could use some help.

What’s the question

Answers are 1,2,4 its correct on edgenuity.

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).