To find the missing denominator in the addition sentence \(1528 + 9\), we need to consider what the expression represents and what is being asked. However, it seems there might be confusion in the phrasing since this is a simple addition problem that doesn't involve a denominator in the traditional sense (as seen in fractions).
If you are looking for the total from the addition \(1528 + 9\):
\[ 1528 + 9 = 1537 \]
If you're referring to some context (such as fractions or something else), please provide more details for clarification. Based on the options provided, none directly relate to the basic arithmetic operation of adding these numbers together.
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