Which Soviet director pioneered montage theory and directed the 1925 silent masterpiece 'Battleship Potemkin', famous for its Odessa Steps sequence?

• A Sergei Eisenstein ✓
• B Dziga Vertov
• C Vsevolod Pudovkin
• D Alexander Dovzhenko

Eisenstein's 'Battleship Potemkin' (1925) revolutionised editing technique; the Odessa Steps sequence, with its montage of a baby carriage rolling down steps amid carnage, remains one of cinema's most quoted scenes.