Because back then they believe that if they didn't see it then it is not there or created for example when the french believe that the earth is flat but we know now that it is round.
I believe its Block Format.
Answer:
B. by explaining that a chemical called dopamine brings a feeling of pleasure to the viewer
Explanation:
I AM IN K12 AND THIS POPPED UP ON MY QUIZ AND IT WAS THE CORRECT ANSWER, HOPE IT HELPS!!!
Also can I please be marked Brainliest!