Multiple choice challenges allow users to select a single flag from a list of choices.
Within the description message you can insert choices for your multiple choice question using the following syntax:
* () Choice 1
* () Choice 2
* () Choice 3
You can then copy the correct choice as a flag.
For example with the following description you will get something like the below image.
* () The Cake
* () 42
* () The Red Umbrella
* () All of the above