The correct option is B i ⇒ b, ii ⇒ c, iii ⇒ d, iv ⇒ a
Solid waste is a problem that needs to be tackled. Otherwise we'll have to deal with a lot of harmful after effects like bad odour of waste, release of toxic fumes and spread of diseases. Contamination also causes air, water and soil pollution. Inorder to tackle this we need to segregate waste depending on their type and choose a proper method of disposal.