'Enjoying a leisurely vacation can be a tough assignment for people who thrive on an upbeat pace in their daily routines. For many, it just is not possible to switch gears into neutral and lie by a pool for a week or more; they need excitement.'' In the passage, what is the author's main point?
A) Active people should take leisurely vacations.
B) Leisurely vacations are not suitable for everyone.
C) Switching gears is challenging for some individuals.
D) People need excitement during vacations.