Individuals who follow their dreams eventually attain them.
Explanation:
In the excerpt, Walden starts off by stating '...if one advances confidently in the direction of his dreams, and endeavors to live the life which he has imagined, he will meet with a success unexpected in common hours.'
The answer is merely a simplified version of what Walden was explaining. You can snuff out keyword such as 'dreams' and 'meet' which mean the same as 'dreams' and 'attain'. The last two option are immediately eliminated as this passage mentioned nothing of cultures. And, the first option couldn't be the answer because the passage mentions nothing of surroundings, so that can be eliminated, leaving the last option as the most logical choice.
