Which 1909 event led to the death of armenian christians at the hands of the ottoman empire’s muslim population? adana massacre holocaust nanking massacre holodomor?

The correct answer is Adana massacre - it was the only event among these to have happened in 1909. Many Christians were slaughtered at the hands of the Ottoman Empire then. 
Holocaust refers to the genocide of Jews which happened between 1933 and 1945. Nankin massacre refers to the Japanese troops rap.ing and murdering thousands of Chinese people during the Second Sino-Japanese War in 1937. Holodomor refers to famine in Soviet Ukraine which killed around 8 million people in 1932.

Cherokee  removal, part of the trail of tears, refers to the  forced  relocation between 1836 and 1839 of thecherokee  nation from  their lands ingeorgia, south carolina, north carolina, tennessee, texas, and alabama to the indian territory (present day oklahoma)  in  the thenwestern united states, and the resultant deaths