Read the following context and choose the best option to answer the question.
Context: After a wonderfully long vacation in Florida ( see previous posts for a few brief highlights ) with Mom and Dad Gregg we fly out of Orlando on September 2 , 2008 . The flight with Aer Lingus leaves Orlando International at 6:00pm and arrives in Dublin at 7:00am on September 3 . After an hour or so layover we will arrive at Heathrow International at 10:15am . At Heathrow we will catch the Oxford Bus to Oxford .
Question: Why is the narrator feeling so tired and exhausted ?
Options: 
A. The narrator experienced a lot of transit .
B. The narrator experienced sensory deprivation .
C. The narrator experienced a sleepless night .
D. The narrator experienced a lack of sleep .


A