Answer:
Grid lines.
Layering.
Printers’ marks.
Threading.
WYSIWYG.
Step-by-step explanation:
DTP means DeskTop Publishing, meaning you do on your computer what was used to be done in a printer shop alone and you format the layout of a newspaper for example. Most of the choices offered are related to a DTP program:
Grid lines: definitely, to align elements and measure them.
Layering: yes, placing elements on top of others to provide a photo background to a boxed text area for example.
Printers’ marks: If you send your work to a printer shop, they'll need to know where to cut the paper, where the bleed is and so on.
Threading: Yes, that's when the text flows from one column to the next, in a multi-column layout, like a newspaper.
WYSIWYG: Of course, What-You-See-Is-What-You-Get is fundamental in DTP programs to help the creator see what he's doing.
The non-related ones:
Red eye editing: That's for a photo editing program. Some DTP programs might have a photo editor built-in, but that would not be a requirement for DTP.
Video formatting: Publishing is mostly related to printed format... the goal is to produce a layout to be printed on paper (or other medium). So, there's no need to do anything about videos in a DTP program.