Answer: B) A new day come to those who are looking for one.
Step-by-step explanation: In the given passage from "Walden" by Henry David Thoreau we can see that the speaker expresses the idea of that we can only see something if we are already looking for it (A new day come to those who are looking for one), this also tries to express that we need to be awake and alert to the opportunities and chances that life offers us, to be able to take them.