What is a rational economic decision? a) one in which there are no opportunity costs. b) one in which marginal benefits exceed marginal costs. c) one in which marginal costs exceed marginal benefits. eliminate d) one in which the benefits are unknown, but costs are low.

I think the answer would be B

Hope this help

B: One in which marginal benefits exceed marginal costs.

Explanation:  

A rational economic decision refers to making decisions by weighing the costs and benefits and trying to maximise the surplus of benefits over costs. The decision made give or provide the greatest benefit or satisfaction among the choices available. It also refers to decision that benefits an individual among the available choice alternatives which allow the individual to choose the best decision he or she prefer.

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explanation:

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the answer would be:

b. race