Final answer:
Gwen and Gram are not close friends but acquaintances who know of each other due to living in the same small community, and their interactions are casual. Twyla and Roberta's friendship didn't endure possibly due to life's changing circumstances and the common reasons friendships evolve.
Step-by-step explanation:
Based on the context given, it appears that Gwen and Gram know each other from living in the same small town and through occasional, casual encounters. The description suggests a familiarity that comes from shared community spaces such as the grocery store or library. Therefore, the most accurate answer supported by the reference provided would be:
Gwen and Gram are acquaintances in the same small community.
As for the question about Twyla and Roberta, their friendship at St. Bonny's was evidently not maintained throughout their lives. Friendships can change over time due to a variety of life events, different paths, or changes in individual interests and values. Without more specific information, it is difficult to pinpoint the exact reason why Twyla and Roberta did not remain friends, but these general factors often contribute to the evolution or dissolution of friendships.