The correct option is D When handwritten, both the parts of the name should be underlined separately.
Certain conventions are followed while writing the scientific names:
∙ The name of the genus begins with a capital letter.
∙ The name of the species begins with a small letter.
∙ When printed, the scientific name is italicised.
∙ When handwritten, the genus name and the species name have to be underlined separately.