The correct option is A height of the plant
Herbarium, collection of dried plant specimens mounted on sheets of paper.
The plants are usually collected in situ (e.g., where they were growing in nature), identified by experts, pressed, and then carefully mounted to archival paper in such a way that all major morphological characteristics are visible.
The mounted plants are labeled with their proper scientific names and local names, the name of the collector, and, usually, information about where they were collected and how they grew and general observations. It does not have information on height of the plant.
So the correct answer is "option a".