Which one of the following is correct if a, b and c are the sides of a triangle ABC and ( begin{vmatrix}a^2 & b^2 & c^2 (a + 1)^2 & (b + 1)^2 & (c + 1)^2 (a 1)^2 & (b 1)^2 & (c 1)^2 end {vmatrix} ) ?

• A. ABC is an equilateral triangle
• B. ABC is an isosceles triangle
• C. ABC is a right angled triangle
• D. ABC is a scalene triangle