The correct answer is option 4, which states that all three - camphor, chicory, and vanilla - are plant products.
Camphor is a natural compound derived from the wood of the Camphor tree, scientifically known as Cinnamomum camphora. It is commonly used for its aromatic properties and has various medicinal applications.
Chicory is a plant that belongs to the dandelion family. Its root has been traditionally used as a coffee substitute and also has medicinal properties.
Vanilla is obtained from the beans of the Vanilla orchid, primarily Vanilla planifolia. The extract is widely used as a flavoring agent in various food and beverage products.
Therefore, all three options - camphor, chicory, and vanilla - are plant products.