Answer:
C. 3 and 4
Step-by-step explanation:
The squares nearest to 12 are ...
3² = 9
(√12)² = 12
4² = 16
Then something whose square is 12 will be between 3 and 4.
I think this is the Transitive postulate of equality.
Personally I can't see much point in giving labels to these equalities.