What does research suggest about crossing time zones and the likelihood of jet lag?

What does research suggest about crossing time zones and the likelihood of jet lag?
A)Travelling more than two time zones eastward usually affects people the most.
B)Travelling less than three time zones eastward is usually tolerated better.
C)Travelling any number of time zones westward is tolerated better than travelling eastward.
D)Travelling in either direction is not tolerated well.


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