Why did Gandhi start 'charkha movement'?

Mahatma Gandhi initiated the Swadeshi movement by taking up the charkha and encouraging the Indians to spin their own cloth. ... The charkha became a symbol of self-sufficiency and freedom, so much so that the first Indian flag designed had the Charkha etched in the middle which was later replaced by the Ashok Chakra.

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answer; (d) they are in charge of the ushers and making sure the audience gets to their seats on time; they also control the box office; i know (c) is wrong and (b) don't make sense;