Printing scientific names in italics has been made mandatory internationally to display what?

Correct answer: Their derivation from Latin language

Correct answer: A in the school-level convention, with a useful qualification. Scientific names are traditionally Latin or latinised, and italics signal that the words are being used as formal scientific names rather than ordinary language. Strictly speaking, italics do not prove that every name was directly taken from classical Latin; names may be formed from other languages but given a Latin grammatical form. Option A is therefore the intended answer because it refers to Latin origin or latinisation. Option B is incorrect because italics do not measure scientific importance. Option C is incorrect because the purpose is standard presentation, not decoration. Option D is incorrect because author identity is shown separately by an author citation. In handwriting, the name is commonly underlined instead of italicised.