Final Answer:
The cost for making bound copies of Cindy's business plan would be $4 per copy (c).
Step-by-step explanation:
Cindy's total cost for making bound copies can be calculated by multiplying the number of copies needed by the cost per copy. In this case, if Cindy needs 'x' copies, the total cost would be 4x. The given options specify different costs per copy: $2 (a), $3 (b), $4 (c), and $5 (d). To minimize the cost, Cindy should choose the option with the lowest cost per copy.
Since $4 (option c) is the most economical choice, Cindy should go with this option to minimize the overall expense. Choosing a higher cost per copy would increase the total cost, while opting for a lower cost per copy would be more cost-effective. Therefore, the most cost-efficient choice for Cindy is $4 per copy (c).