Final answer:
Jonathan Edwards addressed his sermon 'Sinners in the Hands of an Angry God' to the congregation, which is evident from the context he delivers it in.
Step-by-step explanation:
In determining to whom Jonathan Edwards addressed his sermon 'Sinners in the Hands of an Angry God', the context within the sermon itself is crucial for understanding the audience. Edwards was known for his participation in the Great Awakening and his desire to instill a deeper religious fervor within the congregations he spoke to. His sermons were delivered in a direct, yet rational manner, intended to evoke an emotional religious response from his listeners. Therefore, it is clear that option a) He addresses the congregation; we can tell from the context, accurately reflects to whom the sermon was addressed.