Which among the following names is according to the rules of binomial nomenclature?

The correct option is C Cocos nucifera
As per binomial nomenclature:

• Scientific names of organisms have the genus name as the first word and species name as the second word.
• The genus name begins with a capital letter and the species name begins with a small letter.
• When the scientific name is typed or printed, it should be in italics and when handwritten, it should be underlined.
• Hence, Cocos nucifera is the correct form of the given scientific name according to the rules of binomial nomenclature.