Final answer:
After copying the fifth slide, it should be pasted after the sixth slide to maintain the sequential order of the presentation.
Step-by-step explanation:
When copying a slide in a presentation, the positioning of where you paste it depends on the specific order you desire for your presentation. If you copy the fifth slide and want it to remain sequentially correct, the copied slide should be pasted after the fifth slide, which means it would logically become the new sixth slide, pushing the original sixth slide to the position of the seventh slide, and so on.
Therefore, the correct answer is:
a) After the sixth slide