Final answer:
A High Anglican is a devout follower within Anglicanism with Catholic leanings, and Christina Rossetti was involved in the Anglican sisterhood as a writer, aiming to promote religious education.
Step-by-step explanation:
The term High Anglican refers to a tradition within Anglicanism that emphasizes the Catholic heritage and practices of the Anglican Church, particularly in the areas of liturgy and sacraments. It does not refer to a senior member of the Church, a church building, or an Anglican priest aspiring to sainthood. Christina Rossetti, the person mentioned in the question options, was a Victorian poet who had close ties with the Anglican Church. She was involved with the Anglican sisterhood, not as a leader or architect, but through her writing and devotion, embodying the High Anglican's Catholic-leaning traditions. Rossetti's end goal was not ecclesiastical ambition, but rather to promote religious education and piety through her contributions to Anglican spirituality and poetry.