Final answer:
The option b) critical path is the series of tasks that will cause delays in the project completion if they are not completed on time.
Step-by-step explanation:
The critical path is the series of tasks which will extend the project's date if they are delayed(option b).
In the context of engineering projects, such as designing a new video game controller, missing a deadline on the critical path can have significant consequences, including the loss of revenue or market opportunities. Each task on the critical path is pivotal because there is no slack time; any delay will push the entire project's completion date back.