The correct option is C Botanical Garden
Botanic gardens contain collections of plants for education, scientific purposes and display. Botanic gardens also have important conservation collections particularly of rare and threatened plants. According to the IUCN Red List of threatened plants 34,000 taxa are considered globally threatened with extinction. Currently, over 10,000 threatened species, approximately a third, are in botanic garden cultivation. These plants contribute to species recovery programmes and provide long-term backup collections.