The interest group tactic of "lobbying the grassroots" refers to interest groups' efforts to

The interest group tactic of "lobbying the grassroots" refers to interest groups' efforts to win the support of public opinion.

Explanation:

With the "lobbying the grassroots" tactic the interest groups aims to gain public opinion as a way to pressure the government to adhere to the laws and projects that benefit these groups.

in 1989, tiananmen square in beijing was the site of china’s main industries. china’s government headquarters. -pro-democracy demonstrations. (second choice)