Choice "C" is correct. Evaluation of internal and external factors contributing to an organization's success is referred to as Strengths, Weaknesses, Opportunities and Threats (SWOT) analysis. Strengths and weaknesses focus on internal factors while opportunities and threats relate to external factors.
Choice "b" is incorrect. The acronym TOC stands for Theory of Constraints, which is an evaluation technique for optimizing throughput time, it does not relate to overall strategy evaluation.
Choice "a" is incorrect. Brainstorming is a meeting technique used to generate ideas. Although brainstorming could be used as part of an organization's approach to SWOT analysis, it is not, itself, the evaluation of internal and external factors.
Choice "d" is incorrect. A review of the balanced scorecard, which summarizes measures of achievement of critical success factors, does not represent the objective review of internal and external factors that may impact achievement of strategy.