PK0-004 · Question #122
A project has activities on the critical path that must be completed before other activities can start. - Task A is dependent on Task C before Task D can be completed. - Task A requires task B to…
The correct answer is D. B, C, A, D. Given the stated dependencies, the correct critical path ordering is B, C, A, D - reflecting that B must complete first, C follows, then A can start, and finally D can complete.
Question
A project has activities on the critical path that must be completed before other activities can start.
- Task A is dependent on Task C before Task D can be completed.
- Task A requires task B to start.
- Task B takes twice as long to complete as Task C.
Which of the following is the appropriate ordering of the critical path?
Options
- AB, A, D
- BC, B, D, A
- CD, A, C
- DB, C, A, D
How the community answered
(23 responses)- A9% (2)
- B22% (5)
- C9% (2)
- D61% (14)
Why each option
Given the stated dependencies, the correct critical path ordering is B, C, A, D - reflecting that B must complete first, C follows, then A can start, and finally D can complete.
B, A, D omits Task C entirely, ignoring the explicit dependency that Task A is dependent on Task C completing before Task D can be done.
C, B, D, A places Task D before Task A, which directly violates the dependency that Task D cannot be completed until Task A is finished.
D, A, C reverses all stated dependencies - placing D first contradicts that D depends on A, and placing C last contradicts that A depends on C completing first.
Task B must start first because A requires B before it can begin, and B takes twice as long as C, placing it at the head of the chain. Task C must complete before A can start per the stated dependency. Task A then runs after both predecessors are satisfied. Task D cannot be completed until A is done, making D the final task. The resulting critical path is B - C - A - D.
Concept tested: Critical path sequencing with finish-to-start task dependencies
Source: https://www.pmi.org/pmbok-guide-standards/foundational/pmbok
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