Why can boycott in the Non-Cooperation Movement be called a political weapon?

Correct answer: Because it withdrew cooperation from colonial rule

A boycott became a political weapon because it deliberately denied the colonial system the cooperation on which its institutions and markets depended. Students could leave government schools, lawyers could give up colonial courts, and people could reject foreign cloth and titles. These actions challenged both the authority and economic interests of the Raj without using armed force. Therefore A expresses the political purpose; the other choices either reverse the effect or describe something that did not happen.