Two neighboring countries share a river that runs through their territories. The river serves as a vital water source for both countries, supporting agriculture, industry, and the livelihoods of millions of people. However, both countries have been polluting the river with industrial waste, causing severe environmental degradation.The governments of both countries are aware of the pollution issue and are under pressure from their citizens and international organizations to address it. They have the option to implement stringent environmental regulations to reduce pollution  or they can individually pursue short run economic interests by neglecting environmental concerns.If both countries enforce strict pollution control measures, the river's ecosystem will be restored, benefiting the environment, public health, etc. (the return for each country will be equal to b)If only country introduces the environmental policies and invests in pollution control the environmental degradation will persist (the return for both countries will be 0).If both countries neglect environmental concerns and continue polluting the river, the environmental degradation will lead to further ecological damage, health risks, and economic losses for both countries in the long run (the return for each country will be -d).Considering that:The investment associated to the introduction of the strict control measures is equal to c,The investment c is afforded only if the country decides to introduce the strict control measuresThe investment c t is greater than d in absolute termsThe investment c t is lower than b in absolute termsSelect the correct answer:a.If both countries cooperate and enforce strict pollution control measures, they will collectively benefit from a restored ecosystem. However, there is the possibility that without any policy intervention the two countries will not cooperate.b.It is rational for both countries to invest in pollution control measures whatever is the choice of the other country.c.If both countries cooperate, one country may try to take advantage of the other by not complying fully with pollution control measures. in this case the country that do not comply will obtain a higher payoff.d.The  problem can be described as a prisoner dilemma, where the Nash equilibirum is to do not invest.