Вданном отрывке из статьи ввс допущены различные ошибки в пунктуации и/ или грамматике. лишь один из 3-х вариантов является правильным. найдите этот вариант. выберите один ответ: 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)
Запятые здесь служат выделением пояснительной части (Юрий Лужков, управляющий города на протяжении почти двух десятилетий, был смещен с должности).