Final answer:
A guess is not part of the scientific method, which includes making an observation, forming a hypothesis, conducting an experiment, and developing a theory.
Step-by-step explanation:
Among the options provided - hypothesis, experiment, guess, theory - the one that is not a part of the scientific method is c) guess. The scientific method is a systematic way of learning about the world around us and answering questions. The key components of the scientific method include making an observation, forming a hypothesis, conducting an experiment to test the hypothesis, and developing a theory after analyzing the results. A guess does not have a structured place in the scientific method, as it is not based on observation and evidence.