The question asks for the ratio of pears to pomeloes to lemons, in that order.

• Pears = 12
• Pomeloes = 2
• Lemons = 9
• Ratio = 12 : 2 : 9

The ratio of the number of pears to the number of pomeloes to the number of lemons is 12 : 2 : 9.
Check: The order is pears first, pomeloes second, lemons third. 12 : 2 : 9 matches the given counts. ✓

Final Answer: C: 12 : 2 : 9