The correct option to insert in the blank is: B. My.
Thus we will have this;
Have you seen my stapler?
The word, 'My' is a determiner that is used to demonstrate ownership of something. In the sentence above, 'my' was used to stress the fact that the stapler belongs to the speaker.
Therefore, the correct option to insert in the blank space is my.
Learn more about determiners here:
https://brainly.com/question/1790836
