Answer:
The correct answer is letter "C": They were excited about the video conference system.
Explanation:
In order to make sentences more professional and direct, they must be objective. It implies any point of view, perspective, comment, or any subjective piece of information should be deleted so the statement is unbiased. By doing this, we avoid exaggerations or misunderstandings from the author.
In the sentence:
We should delete "totally" which is an individual perception of the author. Then:
Will be a more objective sentence.