Question

a she clarified what she was going to measure; b she picked a pose to hold during the experiment; c she determined how long it would take to complete (partially covered with more button)

Explanation:

To determine the correct option, we analyze each choice. Option A relates to clarifying the measurement (a key part of experimental design, like in scientific method steps where defining what to measure is crucial). Option B about picking a pose is more about the action during the experiment but not a core design step. Since the question likely pertains to experimental setup (Natural Science, e.g., Biology/Physics experiment), clarifying what to measure is a fundamental step in planning an experiment.

Answer:

A. She clarified what she was going to measure