Answer:
All of the above
Step-by-step explanation:
The time spent drawing or writing on the board diminishes the time spent giving the speech. This is because the speaker needs to allocate time for creating the visual content on the board, which can reduce the time available for delivering the speech itself.
Chalk drawings are usually of poor quality. Chalk can be messy and difficult to control, leading to less precise and clear drawings. This can impact the visual effectiveness and clarity of the information being presented.
Time delays occur if the chalk drawing is made prior to the speech. If the speaker prepares the chalk drawing in advance, they might face time delays during the speech as they erase and add new content on the board, especially if the information needs to be modified or updated in real-time.
Therefore, all of the above statements are drawbacks associated with using a chalkboard or whiteboard as a visual aid during a speech.