I would go with option C. Some years back, 1 quart per thousand miles was considered normal. I had a Ford Maverick that I drove practically forever that used 1 quart per thousand miles. My brother had a 1977 Cadillac that used a quart every 900 miles. He bought the car used with about 55,000 miles and sold it with over 200,000 miles on the odometer. The oil consumption never went up.