Which can congress do under the expressed powers granted to it by the constitution? create school systems regulate interstate trade set license requirements overrule the supreme court

Regulate Interstate trade.

Explanation:

The Constitution mentions 27 powers of Congress and there are also some implied powers, which are in Article I, Section 8, but congress cannot overrule the Supreme Court decisions.

Between the powers it is granted for the Congress the power to regulate interstate trade expressed in Article 1, Section 8, Clause 3 (Commerce):

"To regulate Commerce with foreign Nations, and among the several States, and with the Indian Tribes."

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."