Final answer:
The greatest combined benefit for Brian and Edison occurs when both voluntarily contribute to the botanical garden, resulting in a total combined benefit of $1,080.
Step-by-step explanation:
Based on the information provided, we are given a classic scenario of a public goods dilemma, which is similar to a Prisoner's Dilemma. If both Brian and Edison contribute $300 each, the combined benefit from the botanical garden would be $540 each for a total of $1,080, providing the greatest combined benefit. The complete table of combined benefits shows all the possible outcomes:
- Brian and Edison both contribute: $1,080 ($540 each)
- Brian contributes, Edison does not: $870 (Brian gets $540 from the garden and $300 from keeping his money, while Edison gets $270 benefit from Brian's contribution to the garden)
- Edison contributes, Brian does not: $870 (Edison gets $540 from the garden and $300 from keeping his money, while Brian gets $270 benefit from Edison's contribution to the garden)
- Neither contributes: $600 (Both keep their $300)
Answering the question, the option that gives the greatest combined benefits for Brian and Edison is when both voluntarily contribute to the creation of the botanical garden (C).