Definition: This facility was founded in north-central New Mexico during the 1940s in conjunction with the Manhattan Project, the plan to create an atomic bomb.

LocationCentral Ave., Los Alamos, New Mexico

Coordinates35°52′54″N 106°17′54″W

Area22,200 acres (9,000 ha)

Built1943

Explanation:

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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."

she recieved a treatment not thought to be specifically effective in treating her disorder.