Well it seems like in units the questions are added as a practice questions . Well these dont evaluate and its marks does not count in evaluation .Is there any issue you are getting apart from check answer it always shows wrong ?
What is the large text uses for? Is it to submit a response from the student? YES it was present on v3 , basically these type of question used for manually evaluated quizzes in which instructor evaluated manually each answer of the question like subjective exam .
here is the video how to do it : https://somup.com/c0Q2ojALPU