Which of the following functions are continuous at x=11?

• A. ( frac{1}{x^2+x-132} )
• B. ( frac{1}{x^3-7x^2-40x-44} )
• C. ( frac{1}{x^2-2x-143} )
• D. ( frac{x-11}{x^3-23x^2+143x-121} )