China has given this nation an economic boost by purchasing great amounts of natural gas. new zealand papua new guinea federate states of micronesia australia

The answer is: Australia

it is estimated that around 25% of the purchases from Austalia's natural gas product is bought by China. Since australia's remaining economic sector only reliant on farming products (such as beef, wool, and milk). We can safely say that China plays an integral part in boosting Australia's economy.

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."

answer; john locke;