Answer:
The correct answer would be C. Genus.
The scientific name of an organism includes two parts; the species name and the genus name.
The genus name is always written first and it should always start with a capital letter.
The species name is written after genus and is written in small letters.
In addition, the scientific name is written in italics (when typed) or underlined separately (when handwritten).
Similarly, in the species name Pinus palustris, the Pinus refers to the genus name which consists of evergreen conifers.