Until the beginning of 2020 which English county had no branch of McDonald's?

All four answer options are English counties at the time of writing (2020).

Rutland lies in the East Midlands of England, bounded by Leicestershire, Lincolnshire and Northamptonshire. The county is tiny: the maximum north-to-south distance is 18 miles (29 km) and the maximum east-to-west distance is 17 miles (27 km). But its motto, Multum in Parvo ("much in little") is appropriate. It is a historic county which, for a period during the 20th century, became part of Leicestershire. Rutland's county town, Oakham, is a little jewel: the picture is of Oakham's Buttercross and some buildings of Oakham School.

Until January 2020 it was possible to claim that there was no outlet of a fast-food chain anywhere in the county. However, on 14 January 2020, the county council approved an application for a drive-through McDonalds on the outskirts of Oakham, so that Rutland will lose its status as the only English county without a McDonald's.