Concept:Add mixed fractions by separately summing the whole numbers and the fractional parts. Then convert the total fraction to a mixed number if necessary.Explanation:First, write each mixed fraction as a sum: 9951​=99+51​, 9954​=99+54​, 9051​=90+51​.Now group the whole numbers: 99+99+90=288.Group the fractions: 51​+54​+51​=51+4+1​=56​.Convert the improper fraction 56​ into a mixed number: 6÷5=1 remainder 1, so 56​=151​.Add the whole number sum and the mixed fraction: 288+151​=28951​.Answer:28951​; Option A.