In His Early Work When He Was His Own Experimental

In his early work when he was his own experimental subject,the 29-year-old Wilhelm Wundt found that he could ____.​

A) ​pay attention to two things at once
B) not pay attention to two things at once
C) ​pay attention to two things at once,but not three
D) pay attention to three things at once,but not four
E) sustain his attention on one thing for a little less than 12 minutes at a time