What's the compression ratio when the vin code is c?
CREATE TABLE "1975_engines" (
  "engine" text,
  "horsepower" text,
  "torque" text,
  "carburetor" text,
  "compression_ratio" text,
  "bore_stroke" text,
  "vin_code" text
);
SELECT "compression_ratio" FROM "1975_engines" WHERE "vin_code"='c';