Read the information about the three atoms given in the table. which of them are isotopes of each other?
a) x any y
b) x and z
c) y and z
d) x, y, and z
e) there are no isotopes among these atoms

The option A is correct answer. The isotopes are X and Y. The isotopes are those which have same atomic number but different mass number. Since atomic number has same number of protons or electrons. Thus, isotopes have same number of protons or electrons. Therefore, X and Y are isotopes.

C: plants and animals