Question: HopSkipDrive is aimed at youth who are restricted from using the services of the hire company headquartered in what city?

Context paragraphs:
Daimler Hire: Daimler Hire Limited provided a luxury chauffeur-driven Daimler limousine-hire-service from Knightsbridge in London.  Incorporated in 1919 to take over the operations of Daimler's hire department, Daimler Hire was a subsidiary of The Daimler Company Limited.  The company's services later included self-drive hire cars, which continued to the end of the company's existence.  Aviation services introduced in 1919 and motor yacht rental services introduced in 1922 were sold in 1924.

HopSkipDrive: HopSkipDrive is a California-based startup which provides ride-hailing taxi service to kids.  It was founded in 2016 by Joanna McFarland, Carolyn Yashari Becher, and Janelle McGlothin and is aimed at children below the age of 18 years who are legally restricted to avail the services of other ride-hailing services like Uber and Lyft.

FM Rail: FM Rail was a railway charter company based in Derby, England.  The company was formed when spot hire company Fragonset Railways and charter operator Merlin Rail merged.  It went into administration in 2006.

Uber (company): Uber Technologies Inc. is an American private hire company headquartered in San Francisco, California, United States, operating in 633 cities worldwide.  It develops, markets and operates the Uber car transportation and food delivery mobile apps. Uber drivers use their own cars although drivers can rent a car to drive with Uber.

Mellor, Lancashire: Mellor is a village situated in the Borough of Ribble Valley in Lancashire, England.  The population of the civil parish at the 2011 census was 2,262.  It is reasonably large in size for a village, with two churches, one Church of England Parish Church (St Mary's) and one Methodist, as well as a primary school, three public houses and a hotel.  In addition to this there is a post office and general store, several shops, a pharmacy and a private hire company.  There are also three disused quarries and the remains of an eel farm that was destroyed by fire in the 1990s.

Addison Lee: Addison Lee is a London-based private hire company.

British American Railway Services: British American Railway Services (BARS) is a British locomotive and spot hire company.  It is ultimately owned by Iowa Pacific Holdings.

Express Motors: Express Motors is a bus and coach hire company based in Penygroes, Gwynedd.  The company operates public bus services in the Caernarfon, Porthmadog, Blaenau Ffestiniog, Bangor and Llandudno areas, as well as long-distance TrawsCambria service T2 between Bangor and Aberystwyth.

Campervan hire agency: A campervan hire agency is a specialist vehicle hire company which hires out campervans to customers.  These campervans can be privately owned or company owned.  Campervan hire is popular in the UK, especially for music festivals and there are several companies in the market.  Campervan hire is a category of vacation rental.

Livett's Launches: Livett's Launches is a boat hire company on London's River Thames.  The company specializes in filming and marine services, marine logistics, pier bookings and private and ticketed charters along the River Thames in London, United Kingdom.

Supporting paragraphs: HopSkipDrive Uber (company)
Answer: San Francisco, California