a) The residents of Ndola have complained that there is a lack of investment in the water sector by the Ndola city council. Consequently, the council is forced to ration water supplies to households during the dry season, When the council imposes water rationing, it affects the consumer's opportunity sets for each household because the household cannot necessarily buy as much as they want at market prices. The consumer basket of the household consists of food and water, suppose that this year, the council rations water by setting a quota on how much a household can purchase. If a household can afford to buy 12, 000 litres of water per month but the council restricts this to no more than 10,000 litres a month. How does this affect the household's opportunity set? Graphically demonstrate this situation.