Your teacher may believe this is wrong because:
Your use of word choice is poor. Try revising your answer and look for sentences which do not flow and sound all jumbled up.
A lot of your sentences do not make sense to me and so it may be confusing to readers.
The two mediums were text and audio.
When you answered the questions, I did not understand where you were going with it or what you wanted to imply.
Try reading it to a member of your family and ask them for help.
