Ics provides a standardized approach to the command, control, and coordination of emergency personnel.
a. eoc
b. non-activated
c. on-scene
d. off-site

C) On-scene

Explanation:

ICS stand for the incident command system which provides a standard approach to control and coordinate the on-scene emergency. The ICS system is basically used in all the levels of the government and in private sector in an organisation.

A common structure of the ICS system management basically manage, control and coordinate in the organization for communication in the particular sectors.  

This system basically provide 5 major functions that are:

they can increase to boost the enonomy.

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."