Read the following context and choose the best option to answer the question.
Context: Today has been an extremely long day ! We drove for what seemed like days , through what seemed like a hurricane , to Miami . It is my Uncle 's 50th birthday today so we celebrated with him and the rest of our family .
Question: Why was this event , the uncle 's 50th birthday , momentous enough to be worth such an unpleasant drive ?
Options: 
- The uncle offered them each $ 100 dollars if they would be able to make it to the party , so they were sure to attend
 - They had already booked a table at a fancy restaurant , and it was too expensive to cancel on it so they went ahead
 - Because 50th birthdays only happen once , and this was a very special occasion that they would n't miss for the world
 - They have been informed that their uncle has been diagnosed with terminal lung cancer . This could be his last birthday


Because 50th birthdays only happen once , and this was a very special occasion that they would n't miss for the world