The tone of the initial line of dialogue until "Gettysburg" is reassuring, and it utilizes punctuation as a clue. The tone best suited for reading the word "bang" is excited.
The following reasons support this conclusion:
<span>Ringing and vibrating mobile devices interfere with classroom teaching.
</span><span>Numerous applications and website content can contain unsuitable material.</span>
I believe the correct response is C.