Are solvents made from natural sources such as pine and citrus oils.
a) aqueous cleanersb) chlorinec) etheylenesd) terpenes

Option d = terpenes

Explanation:

Terpenes:

It is unsaturated hydrocarbons extracted from the plants specially from pine and citrus. These are cyclic compound with the formula C₁₀H₁₆.

1. It is used as a solvent for natural products.

2. It is used in food , cosmetics and pharmaceutical industries.

3. It is very effective ingredients for agricultural pesticides.

4. It is used as a fragrance in perfumes.

5. As a flavoring agent it is also added into the beverages products.

6. It is highly concentrated and used in very small amount to create fragrances.

7. Its high concentration can led to the bad flavor and fragrances.