In each of the following questions, an idiom/phrase has been used in three different sentences. Choose the option corresponding to the sentence(s) in which the idiom/phrase is used grammatically and contextually correct. BLUE BLOOD
I. Despite his lack of formal training, the young investment analyst possessed an innate blue blood for spotting volatile market anomalies before they manifested.
II. The historical biography meticulously traces how the dynasty protected its blue blood for centuries through highly calculated, politically strategic intermarriages across European courts.
III. Although she grew up in absolute poverty, her refined demeanour and elegant posture led many to mistakenly assume she was a descendant of old European blue blood.