Select the option that is related to the third number in the same way as the second number is related to the first number.
$$10:109::12:?$$

Let's establish the mathematical relation between 10 and 109:
$$10^2+9=100+9=109$$
Applying the same logic to 12:
$$12^2+9=144+9=153$$
Since 153 is not in the options, let's explore an alternative logic:
$$10\times 11-1=110-1=109$$
Let's apply this alternative logic to 12:
$$12\times 11-1=132-1=131$$
This is also not in the options. Let's look for another pattern:
$$10\times 10+9=109$$
Let's see if the number added is related to the number itself (e.g., $\text{number}-1$):For 10: $10\times 10+(10-1)=100+9=109$ For 12: $12\times 12+(12-1)=144+11=155$ — Not present.Let's check if the multiplier or addition depends on standard coefficients:What if the logic is:
$$\text{Number}\times 10+9$$
Let's apply to 12:
$$12\times 10+9=120+9=129$$
This matches Option A perfectly.