Which of the following is the first sentence after rearrangement of the given paragraph?

Rearrange the given five sentences (A),(B),(C),(D) and (E) in the proper sequence so as to form meaningful paragraphs and then answer the given questions. (A)  It also gives us a sense of fulfilment and satisfaction, knowing that we are making a difference in the world. (B)  One of the biggest challenges in life is to find a sense of purpose. (C)  It is a journey that requires introspection and self-discovery. (D)  When we have a sense of purpose, it gives us direction and helps us stay focused. (E)   Without a clear purpose, one can easily get lost in the busyness of life and lose sight of what truly matters.