Algebra-1

Question Analysis
This question checks the understanding of the intersection of three sets by asking for the common elements in a Venn diagram.

Key Concept Explanation
The intersection of three sets () includes all elements that are present in all three sets simultaneously. This is visually represented by the overlapping region of the three circles in a Venn diagram.

Step-by-step Solution
1. Identify the elements in set M, N, and O from the Venn diagram.
2. Locate the region where all three sets M, N, and O overlap.
3. The element in this overlapping region is 12.
4. Therefore,

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