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B, C, D

Explanation:

The Nile River is the longest river in the world.

The Nile flows into the Mediterranean Sea.

The Nile has a length of about 6,695 kilometers (4,160 miles)

Its average discharge is 3.1 million litres (680,000 gallons) per second.

3rd block

Explanation:

the Nile river is ~6000km which making it the longest river in the world

of what agreement it does not show

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."