Determine from the following choices which correctly show the equality and conversion factors for centimeters and inches.

• A. 1 in = 2.54 cm;
  1 in / 2.54 cm and 2.54 cm / 1 in
• B. 1 in = 25.4 cm;
  1 in / 25.4 cm and 25.4 cm / 1 in
• C. 1 in = 10 cm;
  1 in / 10 cm and 10 cm / 1 in
• D. 1 in = 12 cm;
  1 in / 12 cm and 12 cm / 1 in

Answer: (A)