Answer :
Based on the information given, it can be noted that the correct option will be a cost-benefit analysis.
What is a cost-benefit analysis?
A cost-benefit analysis simply means a process that's used for making decisions by looking at the cost and benefits of the alternatives.
In this case, Sally has to look at the cost and benefit of buying the new phone. If the benefits outweigh the cost, then she can purchase the new phone.
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