What is a characteristic of the lecture method used by instructors?

The correct choice highlights that in the lecture method, information flows only one way. This characteristic underscores the traditional structure of lecturing, where the instructor presents information, concepts, or skills without an active exchange of ideas or engagement from the students. Typically, the instructor takes on the role of the primary source of information while the students receive it passively.

This nature of the lecture method can limit interactive discussions, hands-on practice, and feedback, which are key to deeper learning. The other characteristics, while they may be true in certain contexts, do not accurately depict the nature of the lecture format. For instance, it may not always be the most effective method for all learning situations as compared to more interactive or engaging approaches. Similarly, while preparation time can vary, substantial preparation often goes into creating effective lectures to ensure that information is conveyed clearly. The method also doesn't focus on developing performance skills; rather, it is more about imparting knowledge.