Final answer:
Mrs. Smith's prediction that girls in her class will learn more than boys is an opinion.
Step-by-step explanation:
Mrs. Smith's prediction that girls in her class will learn more than boys is a(n) opinion. An opinion is a personal belief or judgment that is not based on facts or evidence. In contrast, a hypothesis is a testable prediction about how the world will behave if a certain idea is correct. It is often worded as an if-then statement. A theory is a set of scientific explanations that has been supported by experiments.