The noun phrase green, leafy vegetables in this sentence functions as the subject as it is the topic of the sentence.
A noun phrase is a word or group of words that has a noun and functions as subjects, objects, prepositional object and as predicative expressions. Noun phrases can be long in length and each and every component of the noun phrase can be changed.
The noun phrase given in the sentence is "green, leafy vegetables" and this noun phrase functions as the subject based on how it is used in the sentence. Therefore, the correct answer would be option D. It functions as the subject because it is the topic of the sentence.
The most likely cause of the beak variation is the food source of the finch, the break size and shape was adapted to most likely have easier and better access to food. <span />
