Question

As per the rules of binomial nomenclature, which species name is written correctly?

Answer 1

As per the rules of bionomial nomenclature, the species name that is written correctly is C. Pelecinus polytyrator (or B, because you wrote two answers which are completely the same).
You capitalize the genus name, but write the specific epithet in small letters. 

Answer 2

Answer: Option B

Explanation: Pelecinus polyturator.

Binomial nomenclature can be defined as a formal system of naming the species of the living things.

It is composed of two parts which uses Latin grammatical forms. According to the binomial nomenclature, the name of the organism must always start from a capital letter and the second should start from a small letter.

The first part of the name signifies the genus of he organism and the second part of the name signifies the specific name of the organism.