Explanation:

- Made of artificial substance or material: This phrase refers to something not naturally occurring, usually created by humans using non-natural materials.

- Option 1: Expensive

- Refers to something that has a high price or cost.

- Does not relate to being artificial or made of non-natural materials.

- Option 2: Offensive

- Means causing someone to feel deeply hurt, upset, or angry.

- Not relevant to the materials from which something is made.

- Option 3: Synthetic

- Refers to products that are made from artificial substances or not originally from natural sources.

- Correctly aligns with the phrase "Made of artificial substance or material".

- Option 4: Authentic

- Means something is genuine or real, typically not artificial.

- Opposite of what the phrase suggests.