What is one reason the cherokees were removed to oklahoma during the infamous "trail of tears"? a) fear of cherokee attacks on white settlers b) cherokee leaders signed away the rights of members of their tribes c) the cherokee moved there voluntarily to escape discrimination in georgia d) a supreme court decision to move the cherokee west of the mississippi river

The answer is D. A Supreme court Decision to move the Cherokee west of the Mississippi River. Here is text from Wikipedia,

"Indian removal was a genocide in the 19th century whereby Native Americans were forced by the United States government to leave their ancestral homelands in the eastern United States to lands west of the Mississippi River, specifically to a designated Indian Territory (roughly, modern Oklahoma)."

to act quickly in times of danger to the united states

because you have to act quickly if you want to live/survive.