Concept:Dividing a total amount in a given ratio by finding each share as a fraction of the total ratio.Explanation:Total number of oranges = 60.Sum of the ratio parts = 5+3+7=15.Justina's ratio part is 3.So Justina's share = 153×60.Simplify: 153=51.Thus, 51×60=12.Answer:Justina received 12 oranges, which is Option B.