B. The United States
The passage gives us one important detail to determine where the women lives: she mentions being a member of the Women's Auxiliary Army Corps.
The Women's Auxiliary Army Corps (later renamed to Women’s Army Corps) was the women's branch of the U.S. Army during WW II, created as an auxiliary unit to the war ongoing. It employed women from all across the country who served in noncombat positions while contributing to the war effort. It mainly existed five broad ranging occupational groups: clerks, domestic services, mechanical maintenance, cookery and tending war graves.
