Tools gather information from sources such as e-mails, text messages, and tweets and make the information instantly and publicly available for use in emergencies. select one: a. crowdsourcing b. social networking c. affective computing d. crisis-mapping

C)Crisis-mapping

Explanation: Crisis mapping is the tool that is used for the gathering of the data, analyzing the information, setting implementation for disaster/ problematic condition.The crisis is increasing because of the increase in the internet facility  and mobile communication technology.Thus, increasing the disaster factors.

Other option are incorrect because the mechanism given in the option does not operate in the situation of the crisis/disaster. Thus, the correct option is option(C).