Which of the following allow you to select more than one slide in a presentation?

Answer: Option C

To select more than one slide in a presentation in PowerPoint, you should use Option C: Shift + Click each slide. This method allows you to select multiple slides consecutively in a sequence.
Option A: Alt + Click each slide is not the standard method for selecting multiple slides in PowerPoint.
Option B: Shift + drag each slide does not typically select multiple slides; it could be used to rearrange them.
Option D: Ctrl + Click each slide selects individual slides but does not allow you to select multiple slides in sequence.
Therefore, the correct answer in this context is Option C: Shift + Click each slide.