In triangle ABC, if \(\frac{{{{\sin }^2}A + {{\sin }^2}B + {{\sin }^2}C}}{{{{\cos }^2}A + {{\cos }^2}B + {{\cos }^2}C}} = 2\) then the triangle is

• A. right-angled
• B. equilateral
• C. isosceles
• D. obtuse-angled