Step 1: Understanding the Concept
Different forms of the same element that differ in structure or number of atoms per molecule are called allotropes.
Step 2: Apply to the question
\(\text{O}_{2}\) has two oxygen atoms per molecule and \(\text{O}_{3}\) has three, but both contain only oxygen.
So they are allotropes.
Step 3: Why the other options fail
Isotopes are atoms of one element with different mass numbers, not different molecules.
'Antelopes' is meaningless here, and neither gas shows amphoterism.
Final Answer:
Ozone and oxygen are allotropes of each other, option (B).
\[ \boxed{\text{(B) }\text{Ozone and Oxygen are allotropes of each other}} \]