How far could one walk before finding the end of the niles flood

sumerians were responsible.

i think the answer is b.

the dominoes began to fall. the surrender at appomattox took place a week later on april 9. while it was the most significant surrender to take place during the civil war, gen. robert e. lee, the confederacy's most respected commander, surrendered only his army of northern virginia to union gen. ulysses s. grant

explanation:

where is the passage

i cant solve it without knowing the passage