Read the given extract/source/passage carefully and answer the questions that follow:

The Non-Cooperation-Khilafat Movement began in January 1921 and started with middle-class participation in the cities. Thousands of students left government-controlled schools and colleges, headmasters and teachers resigned, and lawyers gave up their legal practices. The council elections were boycotted in most provinces except Madras, where the Justice Party, the party of the non-Brahmans, felt that entering the council was one way of gaining some power-something that usually only Brahmans had access to. The effects of non-cooperation on the economic front were more dramatic. Foreign goods were boycotted, liquor shops picketed, and foreign cloth burnt in huge bonfires. The import of foreign cloth halved between 1921 and 1922, its value dropping from 102 crores to 57 crores. In many places, merchants and traders refused to trade in foreign goods or finance foreign trade. As the boycott movement spread, and people began discarding imported clothes and wearing only Indian ones, production of Indian textile mills and handlooms went up.

A form of demonstration used in the ‘Non-cooperation Movement’ is when people block the entrance to a shop, factory, or office is known as: