What would the answer to this be?

And that's poem by ruskin bond what does the use of the word heartbeat suggest about the narrator's attitude towards life

One important character trait which levi to compete well is revealed in the first paragraph. it is that a) he is often fearful. b) he thinks before he acts. c) he tends to be suspicious. d) he is good at finding hidden things.

What is the best prediction of the meaning of thrilling based on the context clues?