Humans Can Travel Across Time Zones Faster Than Our Biological

Humans can travel across time zones faster than our biological clock can reset to the new local time. This causes problems because

A) one's body time may be out of phase with local time, and different body rhythms may be peaking at inappropriate times relative to one another.
B) people traveling west are affected by jet lag, but those traveling east usually are not, creating difficulties in social interactions within the newly formed group.
C) physiological processes may be severely disrupted, interfering with mental process that otherwise typically remain unaffected.
D) the resetting to a new day-night cycle may require several hours to complete.