В данном отрывке из статьи ВВС допущены различные ошибки в пунктуации и/ или грамматике. Лишь один из 3-х вариантов является правильным. Найдите этот вариант.

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1. Mr Sobyanin become mayor in 2010 after Yuri Luzhkov, who had governed the city for almost two decades, was forced out of office. The Kremlin-backed candidate has kept a low profile during the race, shunning debates with the five other candidates.
(From BBC, 9 September 2013)

3.Mr Sobyanin became mayor in 2010 after Yuri Luzhkov, who had governed the city for almost two decades, was forced out of office. The Kremlin-backed candidate has kept a low profile during the race, shunning debates with the five other candidates.
(From BBC, 9 September 2013)

4. Mr Sobyanin became mayor in 2010 after Yuri Luzhkov who had governed the city for almost two decades was forced out of office. The Kremlin-backed candidate has kept a low profile during the race, shunning debates with the five other candidates.
(From BBC, 9 September 2013)