答案：C

解析：

Choice (C) is correct. If these terms were inserted into the sentence, the sentence would read "The success of the Norman Invasion depended on an intricate logistical operation: in planning it, William the Conqueror wisely left no detail overlooked." The sentence indicates that the Norman Invasion was an overall "success" and that William the Conqueror behaved "wisely," so we can infer that the "logistical operation" was well-planned. It is likely, then, that William the Conqueror did not overlook, or neglect, any of the numerous logistical details involved in an "intricate," or complex, operation.