Based on the diagram above, which of the following is true: Group of answer choices If the government issues pollution permits for 150 tons, the price per permit will be $135. If firms are polluting 200 tons, a pigovian tax of 90 would cause them to reduce pollution to 100 tons. If the external cost of pollution is $135/ton, the optimal amount of pollution would be 100 tons. If all firms combined pollute 150 tons, then every single firm must have the same cost of reducing pollution of $90/ton