Answer:
no I do no think it contains a comma splice
<span>The sentence which is the hook in this introductory paragraph is</span><span> For the first time in decades, Baby Boomers have been outnumbered by another group--the Millennials. The answer is letter B. This is the introductory paragraph because this explains the main idea of the paragraph and introduces the topic.</span>
The statement "He was so strong, I expected him to tear off his shirt and reveal an "S" on his chest", provides an allusion that the intensity of his strength can be compared to that of the fictitious character Superman. His strength may just give him authority to carry that "S" symbol.