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Questions asked by users might not always be phrased in the clearest way.
The given neutralization reaction is:
A + M(OH)2 → M(A) + HOH
To determine the basicity of the acid "A", we need to know the number of replaceable hydrogen ions (H+) in the acid molecule. The basicity of an acid refers to the number of H+ ions that can be donated or released by one molecule of the acid. This information is not provided in the given context, so I cannot determine the basicity of acid "A" from the given options.