When was british guiana formed?
a) 1798
b) 1815
c) 1831
d) 1858

it doesn't matches with your options but it was formed in 1814
Although Christopher Columbus sighted Guyana during his third voyage (in 1498), the Dutch were the first to establish colonies: Essequibo (1616), Berbice (1627), and Demerara (1752). After the British assumed control in 1796, the Dutch formally ceded the area in 1814

Air pollution: “combustion results in gases such as nitrogen oxides, nitrogen dioxide and particulates. the main causes of air pollution include transport, domestic combustion and industrial processes. pollutants from these sources can cause problems in the immediate vicinity and a distance away.”