Answer:
D. Include an example of how the movie didn't use correct English.
Step-by-step explanation:
According to the letter from Mr Mix to the editor of the NBC movie 10.5, he stated that the movie was terrible, the action scenes were crammed to make a longer movie, the plot was bad, and worse of all, the use of English was pathetic.
The only thing that Mr Mix should add to his letter to make it more convincing is to include an example of how the movie didn't use correct English.