Roster Form and Solution Sets

Correct answer: A. V = {5}

Explanation: The defining equation x² = 25 has two integer solutions, x = 5 and x = -5, because both 5² and (-5)² equal 25. However, the set-builder description restricts x to natural numbers. The negative value -5 is therefore excluded, leaving only x = 5. The number 25 is not a solution value for x; it is the value of x², so option D confuses the square with the number being squared. Option B ignores the natural-number restriction, and option C keeps only the inadmissible negative solution. Thus the roster form is V = {5}, making option A correct.