D . About 100 trillion stars.
The problem faced when listening to a lecture is attention deficit.
<h3>What is Attention deficit?</h3>
This is a type of brain disorder in which individuals have difficulty in maintaining attention for a long time.
A lecture regardless of the topic being discussed or environment could be faced with attention deficit in individuals who have this issue thereby making it the most appropriate choice.
Read more about Attention deficit here brainly.com/question/11427937
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C. "Wearing a wet half smile, her ancient dog sullenly waddled toward me like Yoda greeting Luke." —Student essay