The correct option is B Botanical garden
Botanical gardens are gardens where plants grown for identification purposes and each plant is labelled indicating its botanical/scientific name and its family.
Biological museums are places that have collections of preserved plant and animal specimens for people to study and for reference.
A herbarium is a place where many plant specimens are collected, dried, pressed and preserved on special sheets called herbarium sheets.
A national park is a large area of land that is protected by the government. Here, the beauty of the nature is preserved and the plants, animals and all other organisms are protected in their natural environments.