In the Terminology of the Critical Path Method,a Critical Path

In the terminology of the Critical Path Method,a critical path is which of the following?

A) the sequence of activities that is expected to take the longest time to complete
B) the composite of tasks in a project that have predecessors; the predecessors are critical to the accomplishment of subsequent tasks
C) a path that includes two or more activities that must be performed simultaneously, and therefore poses complex coordination problems
D) the series of tasks that is expected to take the shortest time to complete