The system of providing a name with two components is called binomial nomenclature.
Each scientific name has two components - genus (generic name) and a specific epithet.
The genus starts with a capital letter while the specific epithet starts with a small letter.
When handwritten, the genus and specific epithet are underlined separately, or printed in italics.
In the case of mango, "Mangifera" is the genus and "indica" is the specific epithet. As per binomial nomenclature, it is written as Mangifera indica.
So, the correct answer is option C.