C. The code
I don't have an explanation
I think it means that his nature/personality like amazes him and it affects the reader to be more kind and not be so selfish.
Self-sufficiency for wheat was achieved in <u><em>the early eighties</em></u>.
Answer:
The student should probably say, "Instead of taking the escalator, use the stairs and even try climbing two at a time."
Explanation:
The first one doesn't explain how to get more exercise, it only explains how to not get injured before doing any physical activity. And the other two are basically irrelevant to the topic.
