What is the displacement & configuration with CO2 of 204 g/km emissions?
CREATE TABLE "engines" (
  "car_model" text,
  "displacement_configuration" text,
  "max_motive_power_rpm" text,
  "max_torque_rpm" text,
  "max_speed" text,
  "emissions_co2" text
);
SELECT "displacement_configuration" FROM "engines" WHERE "emissions_co2"='204 g/km';