On June 4, 1989, students gathered in Tiananmen Square to mourn the death of the pro-reform leader

Hu Yaobang.

Explanation:

The Tiananmen Square protest or also known as the June Fourth Incident is a mass protest taken out by the students after the death of pro-reform Communist general secretary Hu Yaobang. His death set off a massive protest which led to the Communist army opening fire upon the protesters gathered at the Square, which is also known as the now "taboo subject" of the Tiananmen Square massacre.

Hu Yaobang was a high ranking officer who supported and worked towards the introduction of democracy and reformations in China. Though a former member of the Communist Party, his actions and beliefs vastly impressed and influenced the students and general masses but was a direct contradiction to the belief of the Communist leaders. So, he was blamed for the massive outbreak of student protests all through the country, for instilling the idea of democratic reforms in China. He died of a heart attack on April 15, 1989. His death led to the Tiananmen Square protests which led to the massacre.

no options provided, here,but the answer to this question is often: a historian cites a japanese newspaper article published a year after the end of world war ii in order to draw conclusions about the effect of the war on the japanese economy.

clearly from the answer, the historian alludes to historical sources,and records to aid in analyzing and drawing conclusion on the effect of the war on the economy of japan.