Answer:
b. supply, raising the equilibrium price and lowering the equilibrium quantity in the market for artificially sweetened beverages.
Explanation:
In the case when the government impose the tax of 20% on sweetened beverages so here the price should be increased but at the same time the quantity is decreased as the supply curve shifted to the leftward where the demand curve is not impacted at all due to this things the price increased and the demand is decreased
Therefore the option b is correct