GMAT Sentence Correction (SC) | Re: From a very early age, the poet William Blake reportedly

khv It's not quite right to say that "visions of God" is the subject. It's actually the object. "Blake" is the subject and "experienced" is the verb. However, you're right that "who" is incorrect in B. If we want to modify "visions," we want "which," and if we want to modify "God," we'd want to use "whom" unless God were actually serving as the subject (performing an action). If God is just being seen, then we want
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