During which step of the scientific method does a scientist make an educated guess about the outcome of an experiment

hypothesis statement or the very beginning.

The answer is Hypothesis

Explanation:

To perform a scientific method, first the scientist must (1)observe an event of the environment, then, he goes on to the (2)introduction where the observed is analyzed and a question is generated, about the "Why?" of the facts. It is here that the scientist happens to make a supposition known as (3)hypothesis, which must be (4)experienced and (5)demonstrated to finally obtain (6)conclusions about it.

the answer to your question is c.

if you read the house of usher you should know that the house was haunted