Concept:A mixture is a combination of two or more substances that are not chemically combined.Explanation:I. Petroleum is a mixture of many hydrocarbons.II. Rubber latex is a colloidal mixture of rubber particles in water.III. Vulcanizer's solution is a solution, and solutions are homogeneous mixtures.IV. Carbon sulphide is CS2, a pure chemical compound, not a mixture.Thus, the correct mixtures are I, II and III.Answer:A. I, II and III