The sentence is in the passive voice, with the subject (the cascading waterfall) receiving the action of the verb (was photographed). This contrasts with active voice, where the subject performs the action. Thus, the chosen answer is option B: passive voice.
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The sentence uses the passive voice structure, as it indicates that the subject (the cascading waterfall) receives the action of the verb (was photographed). This contrasts with the active voice, where the subject performs the action. The distinction helps clarify who is acting in a sentence versus who is receiving the action. ;