Professor Atkins Wonders Whether More People Attend Confession During the Christmas

Professor Atkins wonders whether more people attend confession during the Christmas season than at other times of the year.Three times per week during the months of February,April,September,and December,he sits quietly at the back of a church and records how many people come in for confession.Professor Atkins is using

A) the observational method.
B) obtrusive observation.
C) the experimental method.
D) archival analysis.
E) participant observation.