The adverb would probably be secretly
<span>The statement about the sentence that is true is B. the sentence needs commas because the participial phrase is nonsessential. Nonessential phrases, unlike essential ones, are not that important in a sentence, and can thus be easily removed without changing the meaning of the sentence drastically. They are always set off from the rest of the sentence by commas, whereas essential phrases don't have commas around them. Here, the nonessential phrase is cradling the baseball in his mitt.</span>
The tone is the way the author expresses his attitude through their writing.
The tone can change, or stay the same way throughout the literary work.
Tone is expressed by your point of view, your diction, etc.
Hope this helped!