Which is responsible for securing u. s. borders and ports? the joint chiefs of staff the national security agency the department of homeland security the office of the director of national intelligence

Question-

 Which is responsible for securing U.S. borders and ports?

A. The Joint Chiefs of Staff.

B. The National Security Agency.

C. The Department of Homeland Security.

D. The Office of the Director of National Intelligence.

Answer-

C, The Department of Homeland Security is responsible for securing U.S. borders and ports.

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the density would be a smaller number.

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."