[
  "Convert both mixed numbers to improper fractions, then find a common denominator before subtracting.",
  "2 1/5 = 11/5 = 99/45. 1 2/9 = 11/9 = 55/45. 99/45 - 55/45 = 44/45. 44/45 is already in simplest form.",
  "Answer: 44/45 (option C)."
]