Answer:
Option C. True
Step-by-step explanation:
The given sets are {51, 52, 51, 52} and {51, 52}
By the definition of equal sets says if two sets have the same elements, sets are called to be equal.
Cardinality of both the sets never affect the equality of the sets.
In the given sets number of elements are different but the elements are same.
Therefore, by the definition of the eqaulity both the sets are equal.
Option C. is the answer.