We know that Jimmy is desperate for his father's approval
- because of the efforts he put into finding out who Mephistopheles was.
The reader can sense that Jimmy was desperate for his father's approval because of the effort he put into uncovering the case of Lucy Welch's death.
The case also worried him as he was seen discussing it with Doctor Larsen. The doctor provided useful tips that helped the case.
After his consultation with Dr. Larsen, he took the photograph's book to all the places Mephistopheles killed women. These places include the bar where Helen Dunn worked and the Huggins apartment.
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D. to convey thoughts and feelings :)
Your answer would be the second one about theatre because the sound in the theater that’s what the question is asking , it has to be more clear for audience and loud so when the audience is watching a movie, they hear what the actresses are saying in the movie :) hope this helps !
