How can you quickly reinstate a deleted footer placeholder in master view?

Answer: Option B

To quickly reinstate a deleted footer placeholder in master view in PowerPoint, you should use Option B: Re-apply the footer placeholder. This option allows you to restore the deleted footer placeholder without creating a new slide master or reapplying the entire slide layout.
Option A: Create a new slide master is unnecessary for simply reinstating a deleted footer placeholder.
Option C: Re-apply the slide layout affects the entire slide layout, not specifically the footer placeholder.
Option D: All of the above is incorrect because Options A and C are not necessary steps for reinstating a deleted footer placeholder.
Therefore, the correct answer in this context is Option B: Re-apply the footer placeholder.