The correct option is A Sparrows
Answer is option A i.e. "Sparrows"
Cross fertilization test have led to unify different groups of sparrows into single species of sparrow in North America These sparrows were earlier separated into distinct species due to morphological and geographical criteria. For example, the union of various species of North American sparrows into one polytypic species consisting of multiple geographic races or subspecies like the song sparrow, Passarella melodia.