Why did the tool only produce values of 1?

An ArcGIS user processes a point feature class using the Collect Events tool. The user finds that the output value for each feature is 1.

Why did the tool only produce values of 1?
A . NONE of the points are co-located
B . mere is only one event to collect
C . All points are within a standard distance of one other point
D . The total value of all events adds up to 1

Answer: B