Susie Sunbeam tuas not her real name;that was Susan Broven, But everyone called her Susie Sunbeam, because she already brought brightness with her wherever she came、Her grandfather gave her this name, and it seemed to fit the little girl so nicely that soon it took the place of her own.The story mainly tells us ___.
选项：

A: what Susie Sunbeam stood for
B: how beautiful Susie Sunbeam was
C: how she got the name Susie Sunbeam
D: how much her grandfather loved her