In an event study, the abnormal return is described as theQuestion 54 options:actual return on a security minus the market rate of return on the same date.total return earned by a security on the date of an announcement affecting that security.total return earned on a security for the 7-day period commencing three days prior to an announcement affecting that security.change in market value of a security on the day of an announcement affecting that security.any change in the market price of a security that exceeds five percent over a 7-day period.