<em>Short answer: B.</em>
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<em>Here is why:</em>
<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>
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<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>
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<em>C simply talks about a specific person, with no implication that their is stereotype involved.</em>
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<em>D simply talks about the family success, with no stereotypical aspect involved.</em>