[
  "Convert both mixed numbers to improper fractions. Find the LCM of 12 and 4 (which is 12) as the common denominator, then subtract.",
  "2 5/12 = 29/12. 1 3/4 = 7/4 = 21/12. 29/12 - 21/12 = 8/12.",
  "8/12 simplifies to 2/3. Answer: 2/3 (option C)."
]