Concept:Convert mixed fractions to improper fractions and simplify using division of fractions.Explanation:First, change each mixed number to an improper fraction:532​=317​, 353​=518​, 151​=56​.Now compute the numerator: 317​−518​=1585−54​=1531​.Divide by the denominator: 1531​÷56​=1531​×65​=1831​.Convert to decimal: 31÷18=1.7222... which rounds to 1.72.Answer:B. 1.72