Quick question: the element oxygen consists of three...?

IHave

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the element oxygen consists of three naturally occuring isotopes: 16O, 17O, and 18O. The atomic mass of oxygen is 16.0 amu. What can be implied about the relative abundance of these isotopes?
a. more than 50% of all O atoms are 17O
b. almost all O atoms are 18O
c. almost all O atoms are 17O
d. the isotopes all have the same abundance, i.e. 33.3%
e. the abundance of 17O and 18O are very small.

I know the anwer to be E. but why does this make sense?
 
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