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1. A “calendar stick” carved centuries ago by the Winnebago tribe may provide the first evidence that the North American Indians have developed advanced full-year calendars basing them on systematic astronomical observation.

(A) that the North American Indians have developed advanced full-year calendars basing them

(B) of the North American Indians who have developed advanced full-year calendars and based them

(C) of the development of advanced full-year calendars by North American Indians, basing them

(D) of the North American Indians and their development of advanced full-year calendars based

(E) that the North American Indians developed advanced full-year calendars based

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