The correct option is D Because some big organisations prohibit Brazilians to do inland fishing.
Organisations like Global Environment facility, World Wildlife Fund- WWF, work round the clock to protect the rainforest and the indigenous tribes in these river basin areas. They understand the concerns of predatory fishing practices which cause fish scarcity, pollution from urban areas, governmental projects like dams, mining that affect the basin and harms biodiversity. They prevent any such activities that cause concern. Thus, inland fishing happens only on a small scale in Brazil.