TOEFL Reading: ETS-TOEFL阅读机经 - L6P8G9I5JXNQKKDBL$

In saying that "Aggressive individuals often precede their attacks with an increase in discharge rate" the author means that A. aggressive individuals often prepare for their attacks by increasing the discharge rate B. aggressive individuals often intensify their attacks by increasing the discharge rate C. attacks by aggressive individuals often increase when there is an increase in the discharge rate D. an increase in the discharge rate often occurs before aggressive individuals attack