Final answer:
A person begins taking action in 'stage 3' of the stages described by sociologists that pertain to the lifecycle of social movements.
Step-by-step explanation:
According to "the stages of committed change," a person actually begins taking action in stage 3. The four stages described by sociologists like Blumer (1969) and Tilly (1978) refer to the lifecycle of social movements. Here, the preliminary stage is all about becoming aware of an issue and leader emergence, followed by the coalescence stage where efforts to publicize and raise awareness take place. The take-action phase aligns with the third stage, which is the institutionalization of the movement, where it transitions from grassroots volunteerism to an established organization with a paid staff. The final stage is the decline of the movement, which can happen for various reasons.