What factors are key to the success of a strike?

The key to the success of a strike largely hinges on several critical factors: public support, financial resources, and the strength of union leadership. Public support is vital because it can influence public opinion and put pressure on the employer, potentially leading to more favorable negotiations. Financial resources are equally important because they determine how long the union can sustain its members during the strike. Unions with stronger financial backing can withstand longer periods without income and continue to support striking workers. Lastly, the strength of union leadership plays a crucial role in mobilizing members, maintaining morale, and crafting strategic plans during the strike. Effective leadership ensures that the union remains unified and focused on its goals, which is essential for the strike's effectiveness and eventual outcome.

Other factors mentioned in the other choices, such as union size and contract length, while they can influence the context of a strike, do not directly reflect the immediate strategic elements that impact its success as comprehensively as public support, financial resources, and leadership strength do. Employee satisfaction and benefits may influence workers’ willingness to strike but are not direct determinants of whether a strike will achieve its objectives. Similarly, negotiation timeframe and working conditions are more related to the context of the employment situation rather than the operational factors that support the strike itself.