First of all, head to the Organizations settings page by clicking your name in the top right corner:

Choose Custom Frameworks under Content in the sidebar. Click on the blue Create new framework button and select a title for your answering options before hitting the Create button. (The rest of the fields are optional)

To start adding answering options, click on the dotted button to the right of the Custom Framework you just created and select Edit content.

Click the Add button and choose Category. Put one of the answering options you want to provide to the Title field and click on Create. You can also add a description to clarify for the reporter what it means to select that answering option; this text will be shown under the answering option.
Do the same for the rest of the answering options you want to provide.

Make sure the answering options are in the right order; this is how they will appear for the reporting users. You can always change the order using the ⌃ arrows to the right.

Hint: The first category that you creates will always appear in the bottom of the list. Therefore, create the list in reverse order.
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When you have created your answering options, you can add them into a requirement package by clicking the Add button and choosing Add information.

Click on the Edit button under Information that can be attached and select Custom alternatives from the drop-down list.

Settings for custom alternatives will appear; click on the change button and select the custom answering options you have created.