The sentence is punctuated correctly, I will get on the bus soon; I should be home before lunch.
In Eay words, punctuation marks are a sign to make and keep meaning within a sentence or to split it up.
For Examples of different punctuation marks have: full stops (.), commas (,), question marks (?).
Thus, option "A" is correct, I will get on the bus soon; I should be home before lunch.
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