Dollar Sign is not declared [duplicate] - javascript

This question already has answers here:
Why do I get "$ is undefined" after using jQuery plugin?
(4 answers)
Closed 6 years ago.
https://studio.code.org/projects/applab/sL7lKBrbXvQbhRGBf54wrQ/
My project is about generating random sentences. How do I make it from here, so that the program picks a random sentence from the index, and displays it on the screen? Please help.
It says that the '$ is not declared'.
Eddie
My coding picture.

All you need to do is include jQuery in your HTML file like so:
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script

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