The correct option is C one should continue to work hard
The stories of Walt Disney, Steve Jobs and Beethoven are inspirational because they are examples of how these people became successful even though they worked in low-paying jobs, dropped out of university and had a few shortcomings (deafness).
As mentioned in the line, "All these people have one thing in common; they faced numerous
rejections yet refused to listen to the discouraging things people said.", it indicates that one must continue to work hard and follow their dreams and passions. Hence option C is correct.
Options A, B and D are not the correct implications of the given passage.
Option A states the opposite of what should be learned as mentioned here: "...they faced numerous
rejections yet refused to listen to the discouraging things people said."
Option B: This line isn't implied in the passage.
Option D: Similarly, this isn't mentioned in the passage. It's the opposite of what's mentioned: "We are not told that we have to face failure and sometimes we stumble and fall down." Life is not simple.