Respuesta :
The answer is A, because beneficial, solute, and equal, do not make sense in the sentence.
Answer:
The correct answer is A.
Explanation:
Nouns cannot modify other nouns. Only adjectives have this characteristic.
Since "equity" is a noun, it cannot appear in the sentence modifying the noun "solution".
Therefore, its adjectival counterpart, "equitable," should be used to replace it.