Final answer:
Emily Dickinson's idea of church in her poem '324' is being outside, where she finds spiritual fulfillment in nature.
Step-by-step explanation:
In Emily Dickinson's poem "324" ("Some keep the Sabbath going to Church"), the poet suggests that her idea of church is C. Being outside. Dickinson creates an image of worship and spirituality that is very personal and connected with nature, rather than the traditional physical church structure. Instead of attending a formal service, Dickinson describes her observance of the Sabbath through her experience of the outdoors, where birds serve as her choir and orchards fulfill the role of church domes.