The correct option is B Triticum aestivum
The rules of binomial nomenclature states that
1. All living organisms should have scientific name consisting of two words, the first is the genus and starts with a capital letter and the second is the species, starting with a small letter.
2. All names should be in italics if typed or printed.
3. When handwritten, the two words of the scientific name are separately underlined.
So the correct scientific name of wheat is Triticum aestivum.