Question

If you want the reader to know what all of your characters are thinking, you must _____.

Answer 1

I'm not sure what context this is in, but you should use omniscient third person point of view.

Answer 2

...Use the third-person omniscient point of view.

Step-by-step explanation:

The third person omniscient point of view is a method of storytelling in which the narrators know all the thoughts and feelings of all the characters in the story.

I hope this answer helps you.