If A = (-1,6,6), B = (-4,9,6), $G=\left(\frac{{\displaystyle 1}}{{\displaystyle 3}}\right)(-5,22,22)$ and G is the centroid of the $\Delta \text{ABC}$ , then the name of the triangle ABC is

• A

  an isosceles triangle

• B

  a right angled triangle

• C

  an equilateral triangle

• D

  a right-angled isosceles triangle