Which line from "land for free" best supports the claim that johann wants to impress hans?

(a) johann raced down and replaced the marker with the one his father had given him.

(b) johann pulled himself up to his full height and said, “papa, i will do my best.”

(c) johann pushed the worry from his mind that they had come all this way for nothing.

(d) johann and the mare ran on and on across the flatlands, then picked their way carefully over ridges.

The answer is (B) Johann pulled himself up to his full height and said, “Papa, I will do my best.”

Here Johann stands up taller, showing with his body language that he wants to seem confident, and tells his father Hans he will do his best--a clear attempt to impress him.

(B) Johann pulled himself up to his full height and said, “Papa, I will do my best.”  

Explanation:

Here Johann stands up taller, appearing with his non-verbal communication that he needs to appear to be certain, and tells his dad Hans he will give a valiant effort - a reasonable endeavor to awe him.

teenagers are certainly stereotyped as moody.

most people view teenagers as naturally moody and grumpy, even when this is wrong. many teens are suffering from depression but it is brushed off as "just a phase" or "that's just cause they're a teenager"