Answer: Donors(people donating for the progress of the society).
Explanation:
The solution or answer to this exam or problem or question can be seen or found in the first sentence of the question, that is;
"Total Accounting has developed new software for nonprofit organizations that allows them to send DONORS receipts via text or email".
Take note of the capitalized word, " donors" because that is the simplest answer to the question.
Therefore, the software was built and designed for people that are going to be donating or giving back to the society. The software is built in such a way that the Total Accounting marketing team can track who donors are.