please solve this economics ques

Use the figure below to answer the following question. Price (dollars per kilogram) N 4 O N Quantity (billions of kilograms per year) The graph shows the market for tomatoes. When the government introduces a subsidy for tomatoes at $4 a kilogram, the quantity produced is because Select one: O inefficient; marginal social cost is zero O efficient; marginal social cost is less than marginal social benefit O efficient; marginal social benefit equals marginal social cost O inefficient; marginal social benefit is less than marginal social cost inefficient; marginal social cost is less than marginal social benefit