Which of the following is one of the earliest examples of genocide
the use of chlorine and mustard gas

the massacre of thousands of armenians

the burning of love in belgium

the sinking of the lusitania

The burning of love in Belgium is the correct answer of this question.

Explanation:

Genocide is the strategic and widespread devastation of one human, race, theological or cultural group, or in whole part. Belgium's burning of love happened on 25 August 1914, which is the oldest of all.The term "genocide" assigns its life to the Polish-Jewish lawyer Raphael Lemkin, who endured the Nazi invasion of Poland and established in the United States in 1941.Lemkin was shocked to hear of the Turkish genocide in World War I of dozens of victims of Armenians.

d is the best answer for this question.