<em>A might seem likely, but is actually incorrect because it does not show enough evidence to be anything more than a statement. It would more likely be a stereotype if the sentence was "All boys" or just "Boys" instead of "the boys", which refers to a specific group of boys.</em>
<em />
<em>B represents a family making boys do an activity. The answer as to why is not certain, but is likely because that is a "boys" thing to do.</em>
<em />
<em>C simply talks about a specific person, with no implication that their is stereotype involved.</em>
<em />
<em>D simply talks about the family success, with no stereotypical aspect involved.</em>
The theme is basically brains over brawn, because the mouse continues to use his intelligence to escape the big and strong creatures that are after him, despite the mouse himself being small and frail.