If you enter an intersection or railroad and get stuck because of all the cars in front of you, you have violated california's law.

Anti Gridlock Law

Explanation:

According to my research on traffic laws in California, I can say that based on the information provided within the question you have violated California's Anti Gridlock Law. This law states that you cannot block an intersection and must leave enough space to get through, and if there are cars on the other side of the intersection you may not cross even if the traffic light is green.

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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."