An attack on the us power grid by terrorists or a foreign power is indicative of: a. ddos attacks. b. espionage. c. cyberwarfare. d. extortion. e. phishing.

There are is no answer in the options
espionage have to do with obtaining political and military information
ddos also called denial of service is attacks on networks
phishing is the attempt to obtain sensitive information
 while extortion is when terrorists or kidnappers take hostages and try to obtain money through threats