Which characteristic is shared by all of the European countries to which communism spread?
O They were all near the Soviet Union.
O They all had direct access to ocean routes.
They were all trading partners of the Soviet Union.
O They all had fought against the Axis Powers in World
War II.

They all had direct access to ocean routes.

They were all trading partners of the Soviet Union.

Explanation:

disorders of the brain include both behavior disorders and other psychiatric illnesses. the primary difference between a behavior disorder and another type of psychiatric disorder is the presence of choice. psychiatric conditions are considered to be involuntary while in behavior disorders, choices are essential.

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."