The right option is; Common names do not always translate accurately.
Scientists use binomial nomenclature instead of common names because common names do not always translate accurately.
Binomial nomenclature is a formal system of naming species (plants and animals) in which species are given two parts names; genus and specific epithet. Scientists use binomial nomenclature instead of common names because common names are not unique and do not describe an organism accurately. Common names cannot be relied upon for accurate information about an organism. Binomial nomenclature is used by scientists because it is unique, descriptive and it gives an idea or information about an organism (such as its physical appearance or regions where it is found). For example the yellow-headed blackbirds have the binomial nomenclature; Xanthocephalus xanthocephalus which means "yellow-headed, yellow head".
