Respuesta :
A. The open spaces and opportunities for independence appealed to many is the sentence that combines these two subjects into one compound subject.
The sentence which uses a compound subject to combine the two sentences is the open spaces and opportunities for independence appealed to many.
the sentence contains two compound subjects, 'the open space' and ' opportunities' which joined by the conjunction 'and.'
The subject in a sentence is the doer of the action, defined as a noun or pronoun. Hence, when a sentence has two or more subjects it is referred as a compound subject.