The answer is (c) when designing an experimental set-up. Here's why: A hypothesis is an educated guess or prediction about what you think will happen in your experiment. It's like a statement that you're trying to prove or disprove. Designing your experiment is where you decide how you'll test your hypothesis. You'll set up the experiment in a way that will help you gather evidence to support or refute your prediction. Let's break down the other options: (a) Recording data: This is about collecting information from your experiment, not making predictions. (b) Trying to answer the problem based on facts and research: This is about analyzing your results and drawing conclusions, which happens after the experiment. (d) Sharing the results of the activity: This is about communicating your findings, which happens after the experiment is done.