Place the description of the strategy used to simplify the problem below the problem.

This choice accurately describes the strategy of decomposing the addends into tens and ones, allowing for easier mental computation. By separating 73 into 70 and 3, and 55 into 50 and 5, one can first add the tens (70 + 50 = 120) and then the ones (3 + 5 = 8), leading to the final sum of 128.

This option describes composing addends into tens and ones but does not relate directly to the problem's requirement of simplifying the original numbers. It focuses on combining single digits rather than breaking down larger numbers, which does not effectively simplify the addition of 73 and 55.

This choice involves a subtraction process rather than addition, making it irrelevant to the problem at hand. It also outlines a different strategy of taking away tens and then ones, which does not apply to the task of simplifying the addition of the two given numbers.

Similar to option C, this choice presents a subtraction method rather than addition, failing to address the problem's context. It also describes the strategy of taking away an extra ten and then adding back ones, which is not applicable when simplifying the addition of 73 and 55.