1646
Over a third of British businesses ( 36 percent ) are not very confident that efforts to completely eradicate a recent ransomware attack from work systems have been successful .
 ( ransom: a recent ransomware attack,  work systems: victim, British businesses: victim) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: phishing, data breach, ransom, discover vulnerability, patch vulnerability, Arguments type: vulnerable system, capabilities, vulnerability, number of victim, issues addressed, compromised data, damage amount, common vulnerabilities and exposures, victim, patch number, number of data, tool, discoverer, time, purpose, place, payment method, releaser, vulnerable system version, attacker, supported platform, patch, price, vulnerable system owner, trusted entity, attack pattern. 
Text: {0} 
Answer:
 ( ransom: a recent ransomware attack,  work systems: victim, British businesses: victim) 