In a sample of methyl ethanoate (CH₃COOCH₃), the two oxygen atoms have the same number of electrons but different numbers of neutrons. Which of the following is the correct Reason for it?
a) Isotopes of oxygen are present in methyl ethanoate.
b) Oxygen exhibits allotropy in methyl ethanoate.
c) Radioactive decay leads to neutron variation in oxygen atoms.
d) Methyl ethanoate undergoes nuclear fusion.