Which sentence best represents a run-on sentence?
a. mark likes to paint he is very talented.
b. i like to go for long walks with my dog in the spring, but i like short walks in the winter because it is so much colder then
c. it often snows in january and february when the humidity is high.
d. my favorite subject in school is english. respond to the question above.?

The line in the excerpt from Eugene O'Neill's "Beyond the Horizon" that reflects the idea of pursuing one's dreams is:

And I’d promise myself that when I grew up and was strong, I’d follow that road, and it and I would find the sea together. (With a smile) You see, my making this trip is only keeping that promise of long ago.

Explanation:

The selected lines are showing the character as he makes plans for the future about following his dreams and illusions and makes them as important as a promise. He really plans to keep his word on this promise and the use of expressions like "I’d follow that road", and "I would find the sea together" support that idea.