Final answer:
The correct answer is d. Both a and b. Chaz meeting Henry seems to have caused a change in Henry, making him less intimidating and allowing him to be friends with Chaz.
Step-by-step explanation:
The correct answer is d. Both a and b. In the given context, Chaz meeting Henry seems to have caused a change in Henry, making him less intimidating and allowing him to be friends with Chaz. The information provided in the reference also supports this, as it mentions Henry being hunched over and having a lower head compared to his friend Achilles, which suggests a change in his demeanor and attitude.