Algebra-1

Question Analysis
This question tests the student's ability to interpret and list elements of a set based on a given condition. The set is defined as the set of all natural numbers that are multiples of 3 and less than 15.

Key Concept Explanation
The key concept here is understanding the definition of multiples of a number and the roster form of a set.

Step-by-step Solution
1. Identify the natural numbers less than 15: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14.
2. Identify the multiples of 3 among these numbers: 3, 6, 9, 12.
3. List these numbers in roster form:

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