Final answer:
Statement a: "An individual who provides leadership and power to create a strategy that will address a problem and get people to contribute to the effort" best captures the concept that "power fills a vacuum" by illustrating how an individual asserts influence to lead and mobilize action in the absence of formal authority.
Step-by-step explanation:
The phrase "power fills a vacuum" suggests that in the absence of formal leadership or control, power will naturally migrate to those who take action or assert influence to fill the gap. Reflecting on the statements provided and the definitions of power by scholars like Max Weber, the best capture of this type of power is statement a: "An individual who provides leadership and power to create a strategy that will address a problem and get people to contribute to the effort". This person is demonstrating power by stepping up to lead, strategize, and mobilize action in a situation where there is no predefined authority to handle the issue at hand.