Answer:
A) Increase government revenue and increase welfare
Explanation:
Based on the elasticity of supply and demand a portion of the tariff will be taken between supplier and consumer but as the work price is 20 dollars a 10 dollar tariff completely passsed through consumers will still leave it below the currnet price of 50 dollars. Hence consumer will import the good increasing welfare as the amount saved will be used for other good or saved and the goverment will increase their revenue by collecting the tariff