Answer:
C. The author is impressed by her friend.
Explanation:
According to the given passage, the author details how busy her friend Sadia is. Not only is she active in sports, but she also ills her spare time<em> "tak[ing] classes at the community college."
</em>
While clearly impressed by the friend, the author couldn't help but add some facts of her own, just to emphasize the busy schedule of Sadia. She added that she thinks<em> "she composes symphonies on the weekends and probably dabbles in particle physics too"</em>, though most probably <em>"for laughs"</em>. This phrase shows that this opinion is nothing but her own.
Thus, the correct answer is option C.
