In Canvas you can give a student another attempt on a quiz, reopen a quiz, and give a student more time on a quiz by using the moderation tool.
Video Walk-Through:
https://player.vimeo.com/video/450231120
Step-by-Step Guide with Screenshots:
1) Open moderation for the quiz.
In Course Navigation, click Quizzes.
Click the name of the quiz.
Click Moderate This Quiz.
View Moderate Quiz columns.
The Moderate Quiz page displays the following information: