The correct parallel structure is the check will arrive today, and the treasurer deposits it today. Thus the correct option is (a).
Parallel structure refers to the arranagment of the phrases and clauses in which there meaning remains the same. It may the use the conjunctions such as and, or etc. It is used to show the ideas of same level of importance.
The correct statement is The check will arrive today, and the treasurer deposits it approved.
Thus the correct option is (a).
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