In the given question we've been given associate degree idiom and that we ought to see that of the given choices matches its that means absolutely.
To understand this well, we want to grasp what the word idiom means that. associate degree idiom may be a cluster of words that along expresses a that means that's completely different from its literal that means.
The idiom that's given within the question, ‘blue blood’ refers to somebody WHO is noble by birth, that's somebody WHO is from associate degree gentle family. you want to not confuse it with its literal that means of getting patrician, it's simply used as associate degree expression to sit down with one thing that's purported to be special.
Let us use this idiom during a sentence and comprehend it better: The patrician of this place prefer to come back here usually.
Now, we'll attempt to perceive choices|the choices} given and choose an acceptable option that best expresses the that means of the given idiom.
Options ‘A’, ‘C’ and ‘D’ ar incorrect as its meanings ar completely different from that of the given idiom and don't relate to the idiom in any manner.
Hence, the right associate degreeswer is possibility ‘B’ an blue blood, because it refers to somebody WHO is noble by birth and thence absolutely explains the that means of the given idiom ‘blue blood’.