The best answer to go with is b
In 1492, Christopher Columbus, supported by the Spanish government, undertook a voyage to find a new route to Asia and inadvertently encountered “new” lands in the Americas full of long established communities and cultures. Other European countries quickly followed suit and began to explore and invade the New World.
By the early 1920s, Chaplin was making his own films with actors Mary Pickford and Douglas Fairbanks due to the establishment of Chaplin Studios and United Artists in 1919. Having control of his own films lead to classics such as 'The Kid', 'The Gold Rush', 'City Lights', 'Modern Times' and 'The Great Dictator'.